{"id":41,"date":"2023-07-20T02:16:42","date_gmt":"2023-07-19T18:16:42","guid":{"rendered":"http:\/\/iwebg.cn\/?p=41"},"modified":"2023-07-20T02:16:42","modified_gmt":"2023-07-19T18:16:42","slug":"2022%e5%b9%b4%e6%9f%90%e5%91%bc%e9%9d%a2%e8%af%95%e9%a2%98%ef%bc%88js%e9%83%a8%e5%88%86%ef%bc%89","status":"publish","type":"post","link":"http:\/\/iwebg.cn\/index.php\/2023\/07\/20\/2022%e5%b9%b4%e6%9f%90%e5%91%bc%e9%9d%a2%e8%af%95%e9%a2%98%ef%bc%88js%e9%83%a8%e5%88%86%ef%bc%89\/","title":{"rendered":"2022\u5e74\u67d0\u547c\u9762\u8bd5\u9898\uff08JS\u90e8\u5206\uff09"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\">1.ES6\u65b0\u589e\u4e86\u54ea\u4e9b\u65b9\u6cd5<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>1\u3001includes\uff08\uff09\u7528\u4e8e\u5224\u65ad\u6570\u7ec4\u662f\u5426\u5305\u542b\u7ed9\u5b9a\u7684\u503c \u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c\n\n2\u3001find\uff08\uff09\u7528\u4e8e\u627e\u51fa\u7b2c\u4e00\u4e2a\u7b26\u5408\u6761\u4ef6\u7684\u6570\u7ec4\u6210\u5458\n\n3\u3001findindex\uff08\uff09\u8fd4\u56de\u7b2c\u4e00\u4e2a\u7b26\u5408\u6761\u4ef6\u7684\u6570\u7ec4\u6210\u5458\u7684\u4f4d\u7f6e\uff0c\u5982\u679c\u6240\u6709\u6210\u5458\u90fd\u4e0d\u7b26\u5408\u6761\u4ef6\uff0c\u5219\u8fd4\u56de-1\n\n4\u3001set\u6570\u636e\u7ed3\u6784\uff0c\u7c7b\u4f3c\u4e8e\u6570\u7ec4\uff0c\u4f46\u662f\u6210\u5458\u7684\u503c\u90fd\u662f\u552f\u4e00\u7684\uff0c\u6ca1\u6709\u91cd\u590d\u7684\u503c\n\n5\u3001\u3001let\u58f0\u660e\u53d8\u91cf\u3001const\u58f0\u660e\u5e38\u91cf\uff08\u8fd9\u91cc\u5c31\u8981\u95ee\u4f60var\u3001let\u3001const\u7684\u533a\u522b\u4e86\uff09\n\n6\u3001\u89e3\u6784\u8d4b\u503c ...<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">set \u548cmap \u7684\u533a\u522b\uff01\uff01\uff01\u4ee5\u524d\u88ab\u95ee\u6ca1\u770b\u8fc7\uff0c\u61f5\u903c\u8fc7\uff0c\u6240\u4ee5\u8981\u8bb0\u4f4f<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Map\u662f\u952e\u503c\u5bf9\uff0cSet\u662f\u503c\u7684\u96c6\u5408\uff0c\u952e\u548c\u503c\u53ef\u4ee5\u662f\u4efb\u4f55\u7684\u503c\uff1b<\/li>\n<\/ul>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Map\u53ef\u4ee5\u901a\u8fc7get\u65b9\u6cd5\u83b7\u53d6\u503c\uff0c\u800cset\u4e0d\u80fd\u56e0\u4e3a\u5b83\u53ea\u6709\u503c\uff0cset\u53ea\u80fd\u7528has\u6765\u5224\u65ad\uff0c\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c\uff1b<\/li>\n\n\n\n<li>Set\u7684\u503c\u662f\u552f\u4e00\u7684\u53ef\u4ee5\u505a\u6570\u7ec4\u53bb\u91cd\uff0cMap\u7531\u4e8e\u6ca1\u6709\u683c\u5f0f\u9650\u5236\uff0c\u53ef\u4ee5\u505a\u6570\u636e\u5b58\u50a8<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2.promiseApi<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Promise\u6784\u5efa\u51fa\u6765\u7684\u5b9e\u4f8b\u5b58\u5728\u4ee5\u4e0b\u65b9\u6cd5\uff1a<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>then() \u662f\u5b9e\u4f8b\u72b6\u6001\u53d1\u751f\u6539\u53d8\u65f6\u7684\u56de\u8c03\u51fd\u6570\uff0c\u7b2c\u4e00\u4e2a\u53c2\u6570\u662fresolved\u72b6\u6001\u7684\u56de\u8c03\u51fd\u6570\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662frejected\u72b6\u6001\u7684\u56de\u8c03\u51fd\u6570<\/li>\n\n\n\n<li>catch() \u7528\u4e8e\u6307\u5b9a\u53d1\u751f\u9519\u8bef\u65f6\u7684\u56de\u8c03\u51fd\u6570<\/li>\n\n\n\n<li>finally() \u7528\u4e8e\u6307\u5b9a\u4e0d\u7ba1 Promise \u5bf9\u8c61\u6700\u540e\u72b6\u6001\u5982\u4f55\uff0c\u90fd\u4f1a\u6267\u884c\u7684\u64cd\u4f5c<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Promise\u6784\u9020\u51fd\u6570\u5b58\u5728\u4ee5\u4e0b\u65b9\u6cd5\uff1a<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>all() \u7528\u4e8e\u5c06\u591a\u4e2a Promise\u5b9e\u4f8b\uff0c\u5305\u88c5\u6210\u4e00\u4e2a\u65b0\u7684 Promise\u5b9e\u4f8b<\/li>\n\n\n\n<li>race() \u540c\u6837\u662f\u5c06\u591a\u4e2a Promise \u5b9e\u4f8b\uff0c\u5305\u88c5\u6210\u4e00\u4e2a\u65b0\u7684 Promise \u5b9e\u4f8b<\/li>\n\n\n\n<li>allSettled()<\/li>\n\n\n\n<li>resolve()<\/li>\n\n\n\n<li>reject()<\/li>\n\n\n\n<li>try()<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3.Var\u3001 let \u3001const \u533a\u522b?<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u53d8\u91cf\u63d0\u5347<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>var\u58f0\u660e\u7684\u53d8\u91cf\u5b58\u5728\u53d8\u91cf\u63d0\u5347\uff0c\u5373\u53d8\u91cf\u53ef\u4ee5\u5728\u58f0\u660e\u4e4b\u524d\u8c03\u7528\uff0c\u503c\u4e3aundefined\nlet\u548cconst\u4e0d\u5b58\u5728\u53d8\u91cf\u63d0\u5347\uff0c\u5373\u5b83\u4eec\u6240\u58f0\u660e\u7684\u53d8\u91cf\u4e00\u5b9a\u8981\u5728\u58f0\u660e\u540e\u4f7f\u7528\uff0c\u5426\u5219\u62a5\u9519<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">js<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6682\u65f6\u6027\u6b7b\u533a<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>var\u4e0d\u5b58\u5728\u6682\u65f6\u6027\u6b7b\u533a\nlet\u548cconst\u5b58\u5728\u6682\u65f6\u6027\u6b7b\u533a\uff0c\u53ea\u6709\u7b49\u5230\u58f0\u660e\u53d8\u91cf\u7684\u90a3\u4e00\u884c\u4ee3\u7801\u51fa\u73b0\uff0c\u624d\u53ef\u4ee5\u83b7\u53d6\u548c\u4f7f\u7528\u8be5\u53d8\u91cf<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5757\u7ea7\u4f5c\u7528\u57df<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>var\u4e0d\u5b58\u5728\u5757\u7ea7\u4f5c\u7528\u57df\nlet\u548cconst\u5b58\u5728\u5757\u7ea7\u4f5c\u7528\u57df<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u91cd\u590d\u58f0\u660e<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>var\u5141\u8bb8\u91cd\u590d\u58f0\u660e\u53d8\u91cf\nlet\u548cconst\u5728\u540c\u4e00\u4f5c\u7528\u57df\u4e0d\u5141\u8bb8\u91cd\u590d\u58f0\u660e\u53d8\u91cf<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4fee\u6539\u58f0\u660e\u7684\u53d8\u91cf<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>var\u548clet\u53ef\u4ee5\nconst\u58f0\u660e\u4e00\u4e2a\u53ea\u8bfb\u7684\u5e38\u91cf\u3002\u4e00\u65e6\u58f0\u660e\uff0c\u5e38\u91cf\u7684\u503c\u5c31\u4e0d\u80fd\u6539\u53d8\n\u4f7f\u7528\n\u80fd\u7528const\u7684\u60c5\u51b5\u5c3d\u91cf\u4f7f\u7528const\uff0c\u5176\u4ed6\u60c5\u51b5\u4e0b\u5927\u591a\u6570\u4f7f\u7528let\uff0c\u907f\u514d\u4f7f\u7528var<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">4.== \u548c ===\u533a\u522b<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u76f8\u7b49\u64cd\u4f5c\u7b26\uff08==\uff09\u4f1a\u505a\u7c7b\u578b\u8f6c\u6362\uff0c\u518d\u8fdb\u884c\u503c\u7684\u6bd4\u8f83\uff0c\u5168\u7b49\u8fd0\u7b97\u7b26(===)\u4e0d\u4f1a\u505a\u7c7b\u578b\u8f6c\u6362<\/p>\n<\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code>let result1 = (\"55\" === 55); \/\/ false\uff0c\u4e0d\u76f8\u7b49\uff0c\u56e0\u4e3a\u6570\u636e\u7c7b\u578b\u4e0d\u540c\nlet result2 = (55 === 55); \/\/ true\uff0c\u76f8\u7b49\uff0c\u56e0\u4e3a\u6570\u636e\u7c7b\u578b\u76f8\u540c\u503c\u4e5f\u76f8\u540c<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">null \u548c undefined \u6bd4\u8f83\uff0c\u76f8\u7b49\u64cd\u4f5c\u7b26\uff08==\uff09\u4e3atrue\uff0c\u5168\u7b49\u4e3afalse<\/p>\n<\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code>let result1 = (null == undefined ); \/\/ true\nlet result2 = (null  === undefined); \/\/ false<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">5.\u6570\u7ec4\u5e38\u7528\u65b9\u6cd5<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u589e<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>push() \u63a5\u6536\u4efb\u610f\u6570\u91cf\u7684\u53c2\u6570\uff0c\u5e76\u5c06\u5b83\u4eec\u6dfb\u52a0\u5230\u6570\u7ec4\u672b\u5c3e\uff0c\u8fd4\u56de\u6570\u7ec4\u7684\u6700\u65b0\u957f\u5ea6<\/li>\n\n\n\n<li>unshift() \u5f00\u5934\u6dfb\u52a0<\/li>\n\n\n\n<li>concat() \u9996\u5148\u4f1a\u521b\u5efa\u4e00\u4e2a\u5f53\u524d\u6570\u7ec4\u7684\u526f\u672c\uff0c\u7136\u540e\u518d\u628a\u5b83\u7684\u53c2\u6570\u6dfb\u52a0\u5230\u526f\u672c\u672b\u5c3e\uff0c\u6700\u540e\u8fd4\u56de\u8fd9\u4e2a\u65b0\u6784\u5efa\u7684\u6570\u7ec4\uff0c\u4e0d\u4f1a\u5f71\u54cd\u539f\u59cb\u6570\u7ec4<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u5220 \uff1a<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>pop() \u5220\u9664\u6570\u7ec4\u7684\u6700\u540e\u4e00\u9879\uff0c\u540c\u65f6\u51cf\u5c11\u6570\u7ec4\u7684length \u503c\uff0c\u8fd4\u56de\u88ab\u5220\u9664\u7684\u9879<\/li>\n\n\n\n<li>shift() \u5220\u9664\u6570\u7ec4\u7684\u7b2c\u4e00\u9879\uff0c\u540c\u65f6\u51cf\u5c11\u6570\u7ec4\u7684length \u503c\uff0c\u8fd4\u56de\u88ab\u5220\u9664\u7684\u9879<\/li>\n\n\n\n<li>splice() \u4f20\u5165\u4e24\u4e2a\u53c2\u6570\uff0c\u5206\u522b\u662f\u5f00\u59cb\u4f4d\u7f6e\uff0c\u5220\u9664\u5143\u7d20\u7684\u6570\u91cf\uff0c\u8fd4\u56de\u5305\u542b\u5220\u9664\u5143\u7d20\u7684\u6570\u7ec4<\/li>\n\n\n\n<li>slice() \u521b\u5efa\u4e00\u4e2a\u5305\u542b\u539f\u6709\u6570\u7ec4\u4e2d\u4e00\u4e2a\u6216\u591a\u4e2a\u5143\u7d20\u7684\u65b0\u6570\u7ec4\uff0c\u4e0d\u4f1a\u5f71\u54cd\u539f\u59cb\u6570\u7ec4<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u6539<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5e38\u7528splice<br>\u4f20\u5165\u4e09\u4e2a\u53c2\u6570\uff0c\u5206\u522b\u662f\u5f00\u59cb\u4f4d\u7f6e\uff0c\u8981\u5220\u9664\u5143\u7d20\u7684\u6570\u91cf\uff0c\u8981\u63d2\u5165\u7684\u4efb\u610f\u591a\u4e2a\u5143\u7d20\uff0c\u8fd4\u56de\u5220\u9664\u5143\u7d20\u7684\u6570\u7ec4\uff0c\u5bf9\u539f\u6570\u7ec4\u4ea7\u751f\u5f71\u54cd<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u67e5<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>indexOf() \u8fd4\u56de\u8981\u67e5\u627e\u7684\u5143\u7d20\u5728\u6570\u7ec4\u4e2d\u7684\u4f4d\u7f6e\uff0c\u5982\u679c\u6ca1\u627e\u5230\u5219\u8fd4\u56de -1<\/li>\n\n\n\n<li>includes() \u8fd4\u56de\u8981\u67e5\u627e\u7684\u5143\u7d20\u5728\u6570\u7ec4\u4e2d\u7684\u4f4d\u7f6e\uff0c\u627e\u5230\u8fd4\u56detrue\uff0c\u5426\u5219false<\/li>\n\n\n\n<li>find() \u8fd4\u56de\u7b2c\u4e00\u4e2a\u5339\u914d\u7684\u5143\u7d20<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u6392\u5e8f\u65b9\u6cd5<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>reverse() \u5c06\u6570\u7ec4\u5143\u7d20\u65b9\u5411\u53cd\u8f6c<\/li>\n\n\n\n<li>sort(\u9996\u5143\u7d20\u5730\u5740(\u5fc5\u586b), \u5c3e\u5143\u7d20\u5730\u5740\u7684\u4e0b\u4e00\u4e2a\u5730\u5740(\u5fc5\u586b), \u6bd4\u8f83\u51fd\u6570(\u975e\u5fc5\u586b));<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u5982\u679c\u76f4\u63a5sort\uff08\u6570\u7ec4\u540d\uff09\uff0c\u5219\u4ece\u5c0f\u5230\u5927\u6392\u5e8f\uff08\u5373\u5347\u5e8f\uff09\uff0c\u4ee5\u4e0b\u4e3a\u5012\u53d9\n\nvar arr4 = &#91;30,10,111,35,1899,50,45];\narr4.sort(function(a,b){\n    return b - a;\n})\nconsole.log(arr4);\/\/\u8f93\u51fa &#91;1899, 111, 50, 45, 35, 30, 10]<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u8f6c\u6362\u65b9\u6cd5<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>join() \u65b9\u6cd5\u63a5\u6536\u4e00\u4e2a\u53c2\u6570\uff0c\u5373\u5b57\u7b26\u4e32\u5206\u9694\u7b26\uff0c\u8fd4\u56de\u5305\u542b\u6240\u6709\u9879\u7684\u5b57\u7b26\u4e32<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u8fed\u4ee3\u65b9\u6cd5<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>some() \u5bf9\u6570\u7ec4\u6bcf\u4e00\u9879\u90fd\u8fd0\u884c\u4f20\u5165\u7684\u51fd\u6570\uff0c\u5982\u679c\u6709\u4e00\u9879\u51fd\u6570\u8fd4\u56de true \uff0c\u5219\u8fd9\u4e2a\u65b9\u6cd5\u8fd4\u56de true<\/li>\n\n\n\n<li>every() \u5bf9\u6570\u7ec4\u6bcf\u4e00\u9879\u90fd\u8fd0\u884c\u4f20\u5165\u7684\u51fd\u6570\uff0c\u5982\u679c\u5bf9\u6bcf\u4e00\u9879\u51fd\u6570\u90fd\u8fd4\u56de true \uff0c\u5219\u8fd9\u4e2a\u65b9\u6cd5\u8fd4\u56de true<\/li>\n\n\n\n<li>forEach() \u5bf9\u6570\u7ec4\u6bcf\u4e00\u9879\u90fd\u8fd0\u884c\u4f20\u5165\u7684\u51fd\u6570\uff0c\u6ca1\u6709\u8fd4\u56de\u503c<\/li>\n\n\n\n<li>filter() \u5bf9\u6570\u7ec4\u6bcf\u4e00\u9879\u90fd\u8fd0\u884c\u4f20\u5165\u7684\u51fd\u6570\uff0c\u51fd\u6570\u8fd4\u56de true \u7684\u9879\u4f1a\u7ec4\u6210\u6570\u7ec4\u4e4b\u540e\u8fd4\u56de<\/li>\n\n\n\n<li>map() \u5bf9\u6570\u7ec4\u6bcf\u4e00\u9879\u90fd\u8fd0\u884c\u4f20\u5165\u7684\u51fd\u6570\uff0c\u8fd4\u56de\u7531\u6bcf\u6b21\u51fd\u6570\u8c03\u7528\u7684\u7ed3\u679c\u6784\u6210\u7684\u6570\u7ec4.<br>\u53bb\u91cd\u65b9\u6cd5<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u53bb\u91cd\u65b9\u6cd5<\/p>\n<\/blockquote>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5229\u7528ES6 Set\u53bb\u91cd<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>function unique (arr) {\n  return Array.from(new Set(arr))\n}\nvar arr = &#91;1,1,'true','true',true,true,15,15,false,false, undefined,undefined, null,null, NaN, NaN,'NaN', 0, 0, 'a', 'a',{},{}];\nconsole.log(unique(arr))\n \/\/&#91;1, \"true\", true, 15, false, undefined, null, NaN, \"NaN\", 0, \"a\", {}, {}]<\/code><\/pre>\n\n\n\n<ol class=\"wp-block-list\" start=\"2\">\n<li>\u5229\u7528for\u5d4c\u5957for\uff0c\u7136\u540esplice\u53bb\u91cd<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>function unique(arr){            \n        for(var i=0; i&lt;arr.length; i++){\n            for(var j=i+1; j&lt;arr.length; j++){\n                if(arr&#91;i]==arr&#91;j]){         \/\/\u7b2c\u4e00\u4e2a\u7b49\u540c\u4e8e\u7b2c\u4e8c\u4e2a\uff0csplice\u65b9\u6cd5\u5220\u9664\u7b2c\u4e8c\u4e2a\n                    arr.splice(j,1);\n                    j--;\n                }\n            }\n        }\nreturn arr;\n}\nvar arr = &#91;1,1,'true','true',true,true,15,15,false,false, undefined,undefined, null,null, NaN, NaN,'NaN', 0, 0, 'a', 'a',{},{}];\n    console.log(unique(arr))\n    \/\/&#91;1, \"true\", 15, false, undefined, NaN, NaN, \"NaN\", \"a\", {\u2026}, {\u2026}]     \/\/NaN\u548c{}\u6ca1\u6709\u53bb\u91cd\uff0c\u4e24\u4e2anull\u76f4\u63a5\u6d88\u5931\u4e86<\/code><\/pre>\n\n\n\n<ol class=\"wp-block-list\" start=\"3\">\n<li>\u5229\u7528indexOf\u53bb\u91cd<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>function unique(arr) {\n    if (!Array.isArray(arr)) {\n        console.log('type error!')\n        return\n    }\n    var array = &#91;];\n    for (var i = 0; i &lt; arr.length; i++) {\n        if (array .indexOf(arr&#91;i]) === -1) {\n            array .push(arr&#91;i])\n        }\n    }\n    return array;\n}\nvar arr = &#91;1,1,'true','true',true,true,15,15,false,false, undefined,undefined, null,null, NaN, NaN,'NaN', 0, 0, 'a', 'a',{},{}];\nconsole.log(unique(arr))\n   \/\/ &#91;1, \"true\", true, 15, false, undefined, null, NaN, NaN, \"NaN\", 0, \"a\", {\u2026}, {\u2026}]  \/\/NaN\u3001{}\u6ca1\u6709\u53bb\u91cd<\/code><\/pre>\n\n\n\n<ol class=\"wp-block-list\" start=\"4\">\n<li>\u5229\u7528includes<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>function unique(arr) {\n    if (!Array.isArray(arr)) {\n        console.log('type error!')\n        return\n    }\n    var array =&#91;];\n    for(var i = 0; i &lt; arr.length; i++) {\n            if( !array.includes( arr&#91;i]) ) {\/\/includes \u68c0\u6d4b\u6570\u7ec4\u662f\u5426\u6709\u67d0\u4e2a\u503c\n                    array.push(arr&#91;i]);\n              }\n    }\n    return array\n}\nvar arr = &#91;1,1,'true','true',true,true,15,15,false,false, undefined,undefined, null,null, NaN, NaN,'NaN', 0, 0, 'a', 'a',{},{}];\n    console.log(unique(arr))\n    \/\/&#91;1, \"true\", true, 15, false, undefined, null, NaN, \"NaN\", 0, \"a\", {\u2026}, {\u2026}]     \/\/{}\u6ca1\u6709\u53bb\u91cd<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">6.bind\u3001call\u3001apply \u533a\u522b<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>call\u548capply\u4f1a\u8c03\u7528\u51fd\u6570\uff0c\u4e14\u4f1a\u6539\u53d8\u51fd\u6570\u5185\u90e8\u7684this\u6307\u5411<\/li>\n\n\n\n<li>call\u548capply\u4f20\u9012\u7684\u53c2\u6570\u4e0d\u4e00\u6837\uff0ccall\u4f20\u9012\u53c2\u6570aru1\uff0caru2.\u5f62\u5f0f \u800capply\u5fc5\u987b\u662f\u6570\u7ec4\u5f62\u5f0f[arg]<\/li>\n\n\n\n<li>bind \u4e0d\u4f1a\u8c03\u7528\u51fd\u6570\uff0c\u53ef\u4ee5\u6539\u53d8\u51fd\u6570\u5185\u90e8\u6307\u5411<\/li>\n<\/ol>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u5e94\u7528\u573a\u666f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>call\u7ecf\u5e38\u505a\u7ee7\u627f<\/li>\n\n\n\n<li>apply\u7ecf\u5e38\u548c\u6570\u7ec4\u6709\u5173\u7cfb\uff0c\u6bd4\u5982\u501f\u52a9\u4e8e\u6570\u5b66\u5bf9\u8c61\u5b9e\u73b0\u6570\u7ec4\u7684max\u3001min<\/li>\n\n\n\n<li>bind\u4e0d\u8c03\u7528\u51fd\u6570\uff0c\u4f46\u6539\u53d8this\u6307\u5411\uff0c\u6bd4\u5982\u6539\u53d8\u5b9a\u65f6\u5668\u5185\u90e8\u7684this\u6307\u5411<br>apply\uff1a\u8c03\u7528\u4e00\u4e2a\u5bf9\u8c61\u7684\u4e00\u4e2a\u65b9\u6cd5\uff0c\u7528\u53e6\u4e00\u4e2a\u5bf9\u8c61\u66ff\u6362\u5f53\u524d\u5bf9\u8c61\u3002\u4f8b\u5982\uff1aB.apply(A, arguments);\u5373 A \u5bf9\u8c61\u5e94\u7528 B \u5bf9\u8c61\u7684\u65b9\u6cd5\u3002 call\uff1a\u8c03\u7528\u4e00\u4e2a\u5bf9\u8c61\u7684\u4e00\u4e2a\u65b9\u6cd5\uff0c\u7528\u53e6\u4e00\u4e2a\u5bf9\u8c61\u66ff\u6362\u5f53\u524d\u5bf9\u8c61\u3002\u4f8b\u5982\uff1aB.call(A, args1,args2); \u5373 A \u5bf9\u8c61\u8c03\u7528 B \u5bf9\u8c61\u7684\u65b9\u6cd5\u3002 bind \u9664\u4e86\u8fd4\u56de\u662f\u51fd\u6570\u4ee5\u5916\uff0c\u5b83\u7684\u53c2\u6570\u548c call \u4e00\u6837\u3002<\/li>\n<\/ul>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">7.\u672c\u5730\u5b58\u50a8\u7684\u65b9\u5f0f\u6709\u54ea\u4e9b\uff1f\u533a\u522b\u53ca\u5e94\u7528\u573a\u666f\uff1f<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">javaScript\u672c\u5730\u7f13\u5b58\u7684\u65b9\u6cd5\u6211\u4eec\u4e3b\u8981\u8bb2\u8ff0\u4ee5\u4e0b\u56db\u79cd\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>cookie<\/li>\n\n\n\n<li>sessionStorage<\/li>\n\n\n\n<li>localStorage<\/li>\n\n\n\n<li>indexedDB<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u533a\u522b<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b58\u50a8\u5927\u5c0f\uff1acookie\u6570\u636e\u5927\u5c0f\u4e0d\u80fd\u8d85\u8fc74k\uff0csessionStorage\u548clocalStorage\u867d\u7136\u4e5f\u6709\u5b58\u50a8\u5927\u5c0f\u7684\u9650\u5236\uff0c\u4f46\u6bd4cookie\u5927\u5f97\u591a\uff0c\u53ef\u4ee5\u8fbe\u52305M\u6216\u66f4\u5927<\/li>\n\n\n\n<li>\u6709\u6548\u65f6\u95f4\uff1alocalStorage\u5b58\u50a8\u6301\u4e45\u6570\u636e\uff0c\u6d4f\u89c8\u5668\u5173\u95ed\u540e\u6570\u636e\u4e0d\u4e22\u5931\u9664\u975e\u4e3b\u52a8\u5220\u9664\u6570\u636e\uff1b sessionStorage\u6570\u636e\u5728\u5f53\u524d\u6d4f\u89c8\u5668\u7a97\u53e3\u5173\u95ed\u540e\u81ea\u52a8\u5220\u9664\uff1bcookie\u8bbe\u7f6e\u7684cookie\u8fc7\u671f\u65f6\u95f4\u4e4b\u524d\u4e00\u76f4\u6709\u6548\uff0c\u5373\u4f7f\u7a97\u53e3\u6216\u6d4f\u89c8\u5668\u5173\u95ed<\/li>\n\n\n\n<li>\u6570\u636e\u4e0e\u670d\u52a1\u5668\u4e4b\u95f4\u7684\u4ea4\u4e92\u65b9\u5f0f\uff0ccookie\u7684\u6570\u636e\u4f1a\u81ea\u52a8\u7684\u4f20\u9012\u5230\u670d\u52a1\u5668\uff0c\u670d\u52a1\u5668\u7aef\u4e5f\u53ef\u4ee5\u5199cookie\u5230\u5ba2\u6237\u7aef\uff1b sessionStorage\u548clocalStorage\u4e0d\u4f1a\u81ea\u52a8\u628a\u6570\u636e\u53d1\u7ed9\u670d\u52a1\u5668\uff0c\u4ec5\u5728\u672c\u5730\u4fdd\u5b58<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u5e94\u7528\u573a\u666f<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6807\u8bb0\u7528\u6237\u4e0e\u8ddf\u8e2a\u7528\u6237\u884c\u4e3a\u7684\u60c5\u51b5\uff0c\u63a8\u8350\u4f7f\u7528cookie<\/li>\n\n\n\n<li>\u9002\u5408\u957f\u671f\u4fdd\u5b58\u5728\u672c\u5730\u7684\u6570\u636e\uff08\u4ee4\u724c\uff09\uff0c\u63a8\u8350\u4f7f\u7528localStorage<\/li>\n\n\n\n<li>\u654f\u611f\u8d26\u53f7\u4e00\u6b21\u6027\u767b\u5f55\uff0c\u63a8\u8350\u4f7f\u7528sessionStorage<\/li>\n\n\n\n<li>\u5b58\u50a8\u5927\u91cf\u6570\u636e\u7684\u60c5\u51b5\u3001\u5728\u7ebf\u6587\u6863\uff08\u5bcc\u6587\u672c\u7f16\u8f91\u5668\uff09\u4fdd\u5b58\u7f16\u8f91\u5386\u53f2\u7684\u60c5\u51b5\uff0c\u63a8\u8350\u4f7f\u7528indexedDB<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">8.\u8bf4\u8bf4\u4f60\u5bf9\u95ed\u5305\u7684\u7406\u89e3\uff1f\u95ed\u5305\u4f7f\u7528\u573a\u666f<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u95ed\u5305\u5c31\u662f\u51fd\u6570\u4e2d\u5305\u542b\u53e6\u4e00\u4e2a\u51fd\u6570\uff0c\u53ef\u4ee5\u8ba9\u4f60\u5728\u51fd\u6570\u5916\u90e8\u8bfb\u53d6\u5230\u5185\u90e8\u7684\u53d8\u91cf\uff08\u5c31\u662f\u5728\u51fd\u6570\u5185\u90e8\u518d\u5b9a\u4e49\u4e00\u4e2a\u51fd\u6570\uff09\uff0c\u8ba9\u8fd9\u4e9b\u53d8\u91cf\u7684\u503c\u59cb\u7ec8\u4fdd\u6301\u5728\u5185\u5b58\u4e2d\uff0c\u53ef\u4ee5\u8fbe\u5230\u5ef6\u957f\u53d8\u91cf\u751f\u547d\u5468\u671f\u7684\u6548\u679c\uff0c\u8fc7\u591a\u4f7f\u7528\u4f1a\u5bfc\u81f4\u5185\u5b58\u6cc4\u6f0f\u7684\u95ee\u9898\uff08\u5728\u521b\u5efa\u79c1\u6709\u53d8\u91cf\u548c\u60f3\u5ef6\u957f\u53d8\u91cf\u7684\u751f\u547d\u5468\u671f\u65f6\u4f1a\u7528\u5230\u95ed\u5305\uff09<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">9.\u6df1\u62f7\u8d1d\u6d45\u62f7\u8d1d\u7684\u533a\u522b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6d45\u62f7\u8d1d<\/strong>\uff0c\u6307\u7684\u662f\u521b\u5efa\u65b0\u7684\u6570\u636e\uff0c\u8fd9\u4e2a\u6570\u636e\u6709\u7740\u539f\u59cb\u6570\u636e\u5c5e\u6027\u503c\u7684\u4e00\u4efd\u7cbe\u786e\u62f7\u8d1d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u5c5e\u6027\u662f\u57fa\u672c\u7c7b\u578b\uff0c\u62f7\u8d1d\u7684\u5c31\u662f\u57fa\u672c\u7c7b\u578b\u7684\u503c\u3002\u5982\u679c\u5c5e\u6027\u662f\u5f15\u7528\u7c7b\u578b\uff0c\u62f7\u8d1d\u7684\u5c31\u662f\u5185\u5b58\u5730\u5740<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728JavaScript\u4e2d\uff0c\u5b58\u5728\u6d45\u62f7\u8d1d\u7684\u73b0\u8c61\u6709\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Object.assign<\/li>\n\n\n\n<li>Array.prototype.slice()<\/li>\n\n\n\n<li>Array.prototype.concat()<\/li>\n\n\n\n<li>\u4f7f\u7528\u62d3\u5c55\u8fd0\u7b97\u7b26\u5b9e\u73b0\u7684\u590d\u5236<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6df1\u62f7\u8d1d<\/strong>\u5f00\u8f9f\u4e00\u4e2a\u65b0\u7684\u6808\uff0c\u4e24\u4e2a\u5bf9\u8c61\u5c5e\u5b8c\u6210\u76f8\u540c\uff0c\u4f46\u662f\u5bf9\u5e94\u4e24\u4e2a\u4e0d\u540c\u7684\u5730\u5740\uff0c\u4fee\u6539\u4e00\u4e2a\u5bf9\u8c61\u7684\u5c5e\u6027\uff0c\u4e0d\u4f1a\u6539\u53d8\u53e6\u4e00\u4e2a\u5bf9\u8c61\u7684\u5c5e\u6027<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5e38\u89c1\u7684\u6df1\u62f7\u8d1d\u65b9\u5f0f\u6709\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>_.cloneDeep()<\/li>\n\n\n\n<li>jQuery.extend()<\/li>\n\n\n\n<li>JSON.stringify()<\/li>\n\n\n\n<li>\u624b\u5199\u5faa\u73af\u9012\u5f52<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">10.JavaScript\u4e2d\u7684\u6570\u636e\u7c7b\u578b\uff1f<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">string\u3001number\u3001Boolean\u3001undefined\u3001null\u3001object<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">11.\u4ec0\u4e48\u662f\u9632\u6296\u548c\u8282\u6d41\uff1f<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u9632\u6296: n \u79d2\u540e\u5728\u6267\u884c\u8be5\u4e8b\u4ef6\uff0c\u82e5\u5728 n \u79d2\u5185\u88ab\u91cd\u590d\u89e6\u53d1\uff0c\u5219\u91cd\u65b0\u8ba1\u65f6<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8282\u6d41: n \u79d2\u5185\u53ea\u8fd0\u884c\u4e00\u6b21\uff0c\u82e5\u5728 n \u79d2\u5185\u91cd\u590d\u89e6\u53d1\uff0c\u53ea\u6709\u4e00\u6b21\u751f\u6548<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">\u7535\u68af\u7b2c\u4e00\u4e2a\u4eba\u8fdb\u6765\u540e\uff0c\u7b49\u5f8515\u79d2\u3002\u5982\u679c\u8fc7\u7a0b\u4e2d\u53c8\u6709\u4eba\u8fdb\u6765\uff0c15\u79d2\u7b49\u5f85\u91cd\u65b0\u8ba1\u65f6\uff0c\u76f4\u523015\u79d2\u540e\u5f00\u59cb\u8fd0\u9001\uff0c\u8fd9\u662f\u9632\u6296<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7535\u68af\u7b2c\u4e00\u4e2a\u4eba\u8fdb\u6765\u540e\uff0c15\u79d2\u540e\u51c6\u65f6\u8fd0\u9001\u4e00\u6b21\uff0c\u8fd9\u662f\u8282\u6d41<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">12.\u5982\u4f55\u89e3\u51b3\u6570\u5b57\u7cbe\u5ea6\u4e22\u5931\u7684\u95ee\u9898?<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7406\u8bba\u4e0a\u7528\u6709\u9650\u7684\u7a7a\u95f4\u6765\u5b58\u50a8\u65e0\u9650\u7684\u5c0f\u6570\u662f\u4e0d\u53ef\u80fd\u4fdd\u8bc1\u7cbe\u786e\u7684\uff0c\u4f46\u6211\u4eec\u53ef\u4ee5\u5904\u7406\u4e00\u4e0b\u5f97\u5230\u6211\u4eec\u671f\u671b\u7684\u7ed3\u679c<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u5f53\u4f60\u62ff\u5230 1.4000000000000001 \u8fd9\u6837\u7684\u6570\u636e\u8981\u5c55\u793a\u65f6\uff0c\u5efa\u8bae\u4f7f\u7528 toPrecision \u51d1\u6574\u5e76 parseFloat \u8f6c\u6210\u6570\u5b57\u540e\u518d\u663e\u793a\uff0c\u5982\u4e0b\uff1a<\/p>\n<\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code>parseFloat(1.4000000000000001.toPrecision(12)) === 1.4  \/\/ True<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c01\u88c5\u6210\u65b9\u6cd5\u5c31\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function strip(num, precision = 12) {\n  return +parseFloat(num.toPrecision(precision));\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u540e\u8fd8\u53ef\u4ee5\u4f7f\u7528\u7b2c\u4e09\u65b9\u5e93\uff0c\u5982Math.js\u3001BigDecimal.js<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">13.JavaScript \u4e2d\u5185\u5b58\u6cc4\u6f0f\u7684\u51e0\u79cd\u60c5\u51b5\uff1f<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528\u95ed\u5305<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">14.\u539f\u578b\uff0c\u539f\u578b\u94fe ? \u6709\u4ec0\u4e48\u7279\u70b9\uff1f<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">JavaScript \u5e38\u88ab\u63cf\u8ff0\u4e3a\u4e00\u79cd\u57fa\u4e8e\u539f\u578b\u7684\u8bed\u8a00\u2014\u2014\u6bcf\u4e2a\u5bf9\u8c61\u62e5\u6709\u4e00\u4e2a\u539f\u578b\u5bf9\u8c61<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u8bd5\u56fe\u8bbf\u95ee\u4e00\u4e2a\u5bf9\u8c61\u7684\u5c5e\u6027\u65f6\uff0c\u5b83\u4e0d\u4ec5\u4ec5\u5728\u8be5\u5bf9\u8c61\u4e0a\u641c\u5bfb\uff0c\u8fd8\u4f1a\u641c\u5bfb\u8be5\u5bf9\u8c61\u7684\u539f\u578b\uff0c\u4ee5\u53ca\u8be5\u5bf9\u8c61\u7684\u539f\u578b\u7684\u539f\u578b\uff0c\u4f9d\u6b21\u5c42\u5c42\u5411\u4e0a\u641c\u7d22\uff0c\u76f4\u5230\u627e\u5230\u4e00\u4e2a\u540d\u5b57\u5339\u914d\u7684\u5c5e\u6027\u6216\u5230\u8fbe\u539f\u578b\u94fe\u7684\u672b\u5c3e<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u539f\u578b\u5bf9\u8c61\u4e5f\u53ef\u80fd\u62e5\u6709\u539f\u578b\uff0c\u5e76\u4ece\u4e2d\u7ee7\u627f\u65b9\u6cd5\u548c\u5c5e\u6027\uff0c\u4e00\u5c42\u4e00\u5c42\u3001\u4ee5\u6b64\u7c7b\u63a8\u3002\u8fd9\u79cd\u5173\u7cfb\u5e38\u88ab\u79f0\u4e3a\u539f\u578b\u94fe (prototype chain)\uff0c\u5b83\u89e3\u91ca\u4e86\u4e3a\u4f55\u4e00\u4e2a\u5bf9\u8c61\u4f1a\u62e5\u6709\u5b9a\u4e49\u5728\u5176\u4ed6\u5bf9\u8c61\u4e2d\u7684\u5c5e\u6027\u548c\u65b9\u6cd5<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">14.\u5982\u4f55\u5b9e\u73b0\u4e0a\u62c9\u52a0\u8f7d\uff0c\u4e0b\u62c9\u5237\u65b0\uff1f<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u5f00\u6e90\u793e\u533a\u6709\u5f88\u591a\u4f18\u79c0\u7684\u89e3\u51b3\u65b9\u6848\uff0c\u5982iscroll\u3001better-scroll\u3001pulltorefresh.js\u5e93\u7b49\u7b49<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">15.\u8bf4\u8bf4\u4f60\u5bf9\u4f5c\u7528\u57df\u94fe\u7684\u7406\u89e3<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f5c\u7528\u57df\u5c31\u662f\u53d8\u91cf\u4e0e\u51fd\u6570\u7684\u53ef\u8bbf\u95ee\u8303\u56f4<\/li>\n\n\n\n<li>\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u53d8\u91cf\u53d6\u503c\u5230\u521b\u5efa\u8fd9\u4e2a\u53d8\u91cf\u7684\u51fd\u6570\u7684\u4f5c\u7528\u57df\u4e2d\u53d6\u503c\u3002 \u4f46\u662f\u5982\u679c\u5728\u5f53\u524d\u4f5c\u7528\u57df\u4e2d\u6ca1\u6709\u67e5\u5230\u503c\uff0c\u5c31\u4f1a\u5411\u4e0a\u7ea7\u4f5c\u7528\u57df\u53bb\u67e5\uff0c\u76f4\u5230\u67e5\u5230\u5168\u5c40\u4f5c\u7528\u57df\uff0c\u8fd9\u4e48\u4e00\u4e2a\u67e5\u627e\u8fc7\u7a0b\u5f62\u6210\u7684\u94fe\u6761\u5c31\u53eb\u505a\u4f5c\u7528\u57df\u94fe<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">16.typeof \u4e0e instanceof \u533a\u522b<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>typeof\u4e0einstanceof\u90fd\u662f\u5224\u65ad\u6570\u636e\u7c7b\u578b\u7684\u65b9\u6cd5\uff0c\u533a\u522b\u5982\u4e0b\uff1a<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">typeof\u4f1a\u8fd4\u56de\u4e00\u4e2a\u53d8\u91cf\u7684\u57fa\u672c\u7c7b\u578b\uff0cinstanceof\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u5e03\u5c14\u503c<br>instanceof \u53ef\u4ee5\u51c6\u786e\u5730\u5224\u65ad\u590d\u6742\u5f15\u7528\u6570\u636e\u7c7b\u578b\uff0c\u4f46\u662f\u4e0d\u80fd\u6b63\u786e\u5224\u65ad\u57fa\u7840\u6570\u636e\u7c7b\u578b<br>\u800ctypeof \u4e5f\u5b58\u5728\u5f0a\u7aef\uff0c\u5b83\u867d\u7136\u53ef\u4ee5\u5224\u65ad\u57fa\u7840\u6570\u636e\u7c7b\u578b\uff08null \u9664\u5916\uff09\uff0c\u4f46\u662f\u5f15\u7528\u6570\u636e\u7c7b\u578b\u4e2d\uff0c\u9664\u4e86function \u7c7b\u578b\u4ee5\u5916\uff0c\u5176\u4ed6\u7684\u4e5f\u65e0\u6cd5\u5224\u65ad<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">17.ajax\u3001axios\u3001jsonp\u7684\u7406\u89e3<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>jsonp\u662f\u4e00\u79cd\u53ef\u4ee5\u89e3\u51b3\u8de8\u57df\u95ee\u9898\u7684\u65b9\u5f0f\uff0c\u5c31\u662f\u901a\u8fc7\u52a8\u6001\u521b\u5efascript\u6807\u7b7e\u7528src\u5f15\u5165\u5916\u90e8\u6587\u4ef6\u5b9e\u73b0\u8de8\u57df\uff0cscript\u52a0\u8f7d\u5b9e\u9645\u4e0a\u5c31\u662f\u4e00\u4e2aget\u8bf7\u6c42\uff0c\u5e76\u4e0d\u80fd\u5b9e\u73b0post\u8bf7\u6c42\u3002(\u5176\u4ed6\u5b9e\u73b0\u8de8\u57df\u7684\u65b9\u6cd5\u6709\uff1aiframe,window.name,postMessage,CORS\u2026)<\/li>\n\n\n\n<li>ajax\u662f\u4e00\u79cd\u6280\u672f\uff0cajax\u6280\u672f\u5305\u542b\u4e86get\u548cpost\u8bf7\u6c42\u7684\uff0c\u4f46\u662f\u5b83\u4ec5\u4ec5\u662f\u4e00\u79cd\u83b7\u53d6\u6570\u636e\u7684\u6280\u672f\uff0c\u4e0d\u80fd\u76f4\u63a5\u5b9e\u73b0\u8de8\u57df\uff0c\u53ea\u6709\u540e\u53f0\u670d\u52a1\u5668\u914d\u7f6e\u597dAccess-Control-Allow-Origin\uff0c\u624d\u53ef\u4ee5\u5b9e\u73b0\u8bf7\u6c42\u7684\u8de8\u57df\u3002<\/li>\n\n\n\n<li>axios\u662f\u901a\u8fc7promise\u5b9e\u73b0\u5bf9ajax\u6280\u672f\u7684\u4e00\u79cd\u5c01\u88c5\uff0caxios\u662fajax\uff0cajax\u4e0d\u6b62axios\u3002<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u603b\u7ed3\uff1a<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">juery\u7684$.ajax\u5b9e\u73b0get\u8bf7\u6c42\u80fd\u8de8\u57df\u662f\u56e0\u4e3ajsonp\u6216\u8005\u56e0\u4e3a\u539f\u751fajax\u548c\u670d\u52a1\u5668\u7684\u914d\u5408\uff0cpost\u8bf7\u6c42\u80fd\u8de8\u57df\u5c31\u53ea\u80fd\u662f\u56e0\u4e3a\u539f\u751fajax\u548c\u670d\u52a1\u5668\u7684\u914d\u5408\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">19.ajax\u7684\u8bf7\u6c42\u8fc7\u7a0b<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ ajax \u63d0\u4ea4 post \u8bf7\u6c42\u7684\u6570\u636e\n\/\/ 1. \u521b\u5efa\u6838\u5fc3\u5bf9\u8c61\nvar xhr = new XMLHttpRequest();\n\/\/ 2. \u51c6\u5907\u5efa\u7acb\u8fde\u63a5\nxhr.open(\"POST\", \"register.php\", true);\n\/\/ 3. \u53d1\u9001\u8bf7\u6c42\n\/\/ \u5982\u679c\u8981POST\u63d0\u4ea4\u6570\u636e\uff0c\u5219\u9700\u8981\u8bbe\u7f6e\u8bf7\u6c42\u5934\n\/\/ \u6709\u7684\u9762\u8bd5\u5b98\u4f1a\u95ee\u4e3a\u4ec0\u4e48\u8981\u8bbe\u7f6e\u8bf7\u6c42\u5934\uff1f \u77e5\u9053\u8bf7\u6c42\u6b63\u6587\u662f\u4ee5\u4ec0\u4e48\u683c\u5f0f\n\/\/ Content-Type: application\/x-www-form-urlencoded\uff0c\u8bf7\u6c42\u6b63\u6587\u662f\u7c7b\u4f3c get \u8bf7\u6c42 url \u7684\u8bf7\u6c42\u53c2\u6570\n\/\/ Content-Type: application\/json\uff0c\u8bf7\u6c42\u6b63\u6587\u662f\u4e00\u4e2a json \u683c\u5f0f\u7684\u5b57\u7b26\u4e32\nxhr.setRequestHeader(\"Content-Type\", \"application\/x-www-form-urlencoded\");\n\/\/ \u53d1\u9001\u6570\u636e\nxhr.send(querystring);\n\/\/ 4. \u5904\u7406\u54cd\u5e94\nxhr.onreadystatechange = function () {\n     if (xhr.readyState === 4) { \/\/ \u8bf7\u6c42\u5904\u7406\u5b8c\u6bd5\uff0c\u54cd\u5e94\u5c31\u7eea\n          if (xhr.status === 200) { \/\/ \u8bf7\u6c42\u6210\u529f\n               var data = xhr.responseText;\n               console.log(data);\n          }\n     }\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">20.ajax\u8bf7\u6c42\u7684\u65f6\u5019get \u548cpost\u65b9\u5f0f\u7684\u533a\u522b<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>get\u8bf7\u6c42\u4e0d\u5b89\u5168\uff0cpost\u5b89\u5168 \uff1b<\/li>\n\n\n\n<li>get\u8bf7\u6c42\u6570\u636e\u6709\u5927\u5c0f\u9650\u5236\uff0cpost\u65e0\u9650\u5236 \uff1b<\/li>\n\n\n\n<li>get\u8bf7\u6c42\u53c2\u6570\u4f1a\u5728url\u4e2d\u663e\u793a\uff0c\u5bb9\u6613\u88ab\u4ed6\u4eba\u7a83\u53d6\uff0cpost\u5728\u8bf7\u6c42\u4f53\u4e2d<\/li>\n\n\n\n<li>post\u9700\u8981\u8bbe\u7f6e\u8bf7\u6c42\u5934\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">21.\u4ec0\u4e48\u662f\u4e8b\u4ef6\u59d4\u6258\u4ee5\u53ca\u4f18\u7f3a\u70b9<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">js\u4e8b\u4ef6\u59d4\u6258\u5c31\u662f\u5229\u7528\u5192\u6ce1\u7684\u539f\u7406\uff0c\u628a\u672c\u5e94\u8be5\u6dfb\u52a0\u5230\u67d0\u4e2a\u5143\u7d20\u4e0a\u7684\u4e8b\u4ef6\u59d4\u6258\u7ed9\u4ed6\u7684\u7236\u7ea7\uff0c\u4ece\u800c\u51cf\u5c11DOM\u4ea4\u4e92\u8fbe\u5230\u7f51\u9875\u4f18\u5316\u3002<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f18\u70b9\uff1a<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">1.\u53ef\u4ee5\u5927\u91cf\u8282\u7701\u5185\u5b58\u5360\u7528\uff0c\u51cf\u5c11\u4e8b\u4ef6\u6ce8\u518c\u3002\u6bd4\u5982ul\u4e0a\u4ee3\u7406\u6240\u6709li\u7684click\u4e8b\u4ef6\u5c31\u5f88\u4e0d\u9519\u3002 2.\u53ef\u4ee5\u5b9e\u73b0\u5f53\u65b0\u589e\u5b50\u5bf9\u8c61\u65f6\uff0c\u65e0\u9700\u518d\u5bf9\u5176\u8fdb\u884c\u4e8b\u4ef6\u7ed1\u5b9a\uff0c\u5bf9\u4e8e\u52a8\u6001\u5185\u5bb9\u90e8\u5206\u5c24\u4e3a\u5408\u9002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7f3a\u70b9\uff1a<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e8b\u4ef6\u4ee3\u7406\u7684\u5e38\u7528\u5e94\u7528\u5e94\u8be5\u4ec5\u9650\u4e8e\u4e0a\u8ff0\u9700\u6c42\uff0c\u5982\u679c\u628a\u6240\u6709\u4e8b\u4ef6\u90fd\u7528\u4e8b\u4ef6\u4ee3\u7406\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u4e8b\u4ef6\u8bef\u5224\u3002\u5373\u672c\u4e0d\u8be5\u88ab\u89e6\u53d1\u7684\u4e8b\u4ef6\u88ab\u7ed1\u5b9a\u4e0a\u4e86\u4e8b\u4ef6\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/zhuanlan.zhihu.com\/p\/422730888\">\u539f\u6587\u94fe\u63a5<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>1.ES6\u65b0\u589e\u4e86\u54ea\u4e9b\u65b9\u6cd5 2.promiseApi Promise\u6784\u5efa\u51fa\u6765\u7684\u5b9e\u4f8b\u5b58\u5728\u4ee5\u4e0b\u65b9\u6cd5\uff1a Promise [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[6,5],"class_list":["post-41","post","type-post","status-publish","format-standard","hentry","category-3","tag-js","tag-5"],"_links":{"self":[{"href":"http:\/\/iwebg.cn\/index.php\/wp-json\/wp\/v2\/posts\/41","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/iwebg.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/iwebg.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/iwebg.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/iwebg.cn\/index.php\/wp-json\/wp\/v2\/comments?post=41"}],"version-history":[{"count":1,"href":"http:\/\/iwebg.cn\/index.php\/wp-json\/wp\/v2\/posts\/41\/revisions"}],"predecessor-version":[{"id":42,"href":"http:\/\/iwebg.cn\/index.php\/wp-json\/wp\/v2\/posts\/41\/revisions\/42"}],"wp:attachment":[{"href":"http:\/\/iwebg.cn\/index.php\/wp-json\/wp\/v2\/media?parent=41"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/iwebg.cn\/index.php\/wp-json\/wp\/v2\/categories?post=41"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/iwebg.cn\/index.php\/wp-json\/wp\/v2\/tags?post=41"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}