{"id":355,"date":"2023-08-04T17:34:46","date_gmt":"2023-08-04T09:34:46","guid":{"rendered":"https:\/\/iwebg.cn\/?p=355"},"modified":"2023-08-04T17:34:46","modified_gmt":"2023-08-04T09:34:46","slug":"map-%e5%92%8c-weakmap%e7%9a%84%e5%8c%ba%e5%88%ab","status":"publish","type":"post","link":"http:\/\/iwebg.cn\/index.php\/2023\/08\/04\/map-%e5%92%8c-weakmap%e7%9a%84%e5%8c%ba%e5%88%ab\/","title":{"rendered":"Map \u548c weakMap\u7684\u533a\u522b"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u9996\u5148\u8981\u77e5\u9053\uff0c\u5728JS\u56de\u6536\u673a\u5236\uff0c\u5f53\u5806\u6808\u4e0d\u518d\u88ab\u5f15\u7528\u7684\u65f6\u5019\uff0c\u6d4f\u89c8\u5668\u5185\u6838\u4f1a\u81ea\u52a8\u56de\u6536\u8fd9\u4e2a\u6570\u636e<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u4f7f\u7528map\u7684\u65f6\u5019\u4f1a\u89e6\u53d1\u4e00\u4e2a\u5783\u573e\u56de\u6536\u673a\u5236\u7684\u95ee\u9898<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u9996\u5148Map\u662f\u4e00\u79cd\u952e\u503c\u5bf9\u7684\u96c6\u5408\uff0c\u5176\u4e2d\u7684\u952e\u548c\u503c\u53ef\u4ee5\u662f\u4efb\u610f\u7c7b\u578b\u7684\u3002\u4e0e\u5bf9\u8c61\u7c7b\u4f3c\uff0c\u5b83\u4eec\u53ef\u4ee5\u901a\u8fc7\u952e\u6765\u8bbf\u95ee\u503c\u3002\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e\uff0cMap\u53ef\u4ee5\u4f7f\u7528\u4efb\u610f\u7c7b\u578b\u4f5c\u4e3a\u952e\uff0c\u800c\u5bf9\u8c61\u53ea\u80fd\u4f7f\u7528\u5b57\u7b26\u4e32\u6216Symbol\u7c7b\u578b\u4f5c\u4e3a\u952e\u3002Map\u8fd8\u63d0\u4f9b\u4e86\u8bb8\u591a\u6709\u7528\u7684\u65b9\u6cd5\uff0c\u4f8b\u5982size\u5c5e\u6027\u6765\u83b7\u53d6\u952e\u503c\u5bf9\u7684\u6570\u91cf\uff0c\u4ee5\u53caforEach()\u65b9\u6cd5\u6765\u904d\u5386\u96c6\u5408\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Map\u91cc\u9762\u5982\u679c\u5b58\u5728\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5f53\u8fd9\u4e2a\u5bf9\u8c61\u88ab\u5220\u9664\u7684\u65f6\u5019\uff0c\u5b9e\u9645\u4e0a\u5728\u6d4f\u89c8\u5668\u7684\u5806\u91cc\u5b83\u5e76\u4e0d\u4f1a\u88ab\u5220\u9664\uff0c\u56e0\u4e3a\u5b83\u8fd8\u88abmap\u5f15\u7528\u7740\uff0c\u8fd9\u4e2a\u65f6\u5019\u540e\u7eed\u5982\u679c\u5bf9\u8fd9\u4e2a\u5bf9\u8c61\u8fdb\u884c\u64cd\u4f5c\u5c31\u6709\u53ef\u80fd\u51fa\u73b0\u5185\u5b58\u6cc4\u9732\u95ee\u9898<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u91cc\u5c31\u8981\u8bf4\u5230\u6211\u4eec\u7684weakMap\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">WeakMap \u662f\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u4e0e Map \u7c7b\u4f3c\uff0c\u4f46\u662f\u5b83\u5b58\u50a8\u7684\u662f\u952e\u503c\u5bf9\uff0c\u5176\u4e2d\u952e\u662f\u5bf9\u8c61\u7c7b\u578b\uff0c\u800c\u503c\u662f\u4efb\u610f\u7c7b\u578b\u3002\u4e0e Map \u4e0d\u540c\u7684\u662f\uff0cWeakMap \u7684\u952e\u662f\u5f31\u5f15\u7528\uff0c\u8fd9\u610f\u5473\u7740\u5982\u679c\u6ca1\u6709\u5176\u4ed6\u53d8\u91cf\u5f15\u7528\u8be5\u5bf9\u8c61\uff0c\u90a3\u4e48\u5783\u573e\u56de\u6536\u673a\u5236\u4f1a\u81ea\u52a8\u56de\u6536\u8be5\u5bf9\u8c61\u6240\u5360\u7528\u7684\u5185\u5b58\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f7f\u7528 WeakMap \u7684\u4e3b\u8981\u539f\u56e0\u662f\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u5e0c\u671b\u5b58\u50a8\u4e00\u4e9b\u4e0e\u5bf9\u8c61\u76f8\u5173\u7684\u4fe1\u606f\uff0c\u4f46\u662f\u53c8\u4e0d\u5e0c\u671b\u8fd9\u4e9b\u4fe1\u606f\u963b\u6b62\u5783\u573e\u56de\u6536\u673a\u5236\u56de\u6536\u5bf9\u8c61\u6240\u5360\u7528\u7684\u5185\u5b58\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">weakMap\u81ea\u8eab\u7684\u65b9\u6cd5\u4e5f\u6bd4map\u5c11\u4e86\u8bb8\u591a\uff0c\u6211\u4eec\u6765\u505a\u4e2a\u5bf9\u6bd4<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/iwebg.cn\/wp-content\/uploads\/2023\/08\/305217be03bc272f3775340ebd7e5dd.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"595\" height=\"385\" data-original=\"https:\/\/iwebg.cn\/wp-content\/uploads\/2023\/08\/305217be03bc272f3775340ebd7e5dd.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-374\"  sizes=\"auto, (max-width: 595px) 100vw, 595px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/iwebg.cn\/wp-content\/uploads\/2023\/08\/78a72f3d2f02d4bfedc178facb7e935.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"538\" height=\"166\" data-original=\"https:\/\/iwebg.cn\/wp-content\/uploads\/2023\/08\/78a72f3d2f02d4bfedc178facb7e935.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-375\"  sizes=\"auto, (max-width: 538px) 100vw, 538px\" \/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">weakmap\u7684\u539f\u578b\u4e0a\u6ca1\u6709<strong>Symbol(Symbol.iterator)<\/strong>\u8fd9\u4e2a\u539f\u59cb\u65b9\u6cd5\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u7684\u4e3b\u8981\u4f5c\u7528\u662f\u4e3a\u6bcf\u4e00\u4e2a\u5bf9\u8c61\u5b9a\u4e49\u4e86\u9ed8\u8ba4\u7684\u8fed\u4ee3\u5668\u3002\u8be5\u8fed\u4ee3\u5668\u53ef\u4ee5\u88ab\u00a0<a href=\"https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/JavaScript\/Reference\/Statements\/for...of\"><code>for...of<\/code><\/a>\u00a0\u5faa\u73af\u4f7f\u7528<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const iterable1 = {};\n\niterable1&#91;Symbol.iterator] = function* () {\n  yield 1;\n  yield 2;\n  yield 3;\n};\n\nconsole.log(&#91;...iterable1]);\n\/\/ Expected output: Array &#91;1, 2, 3]<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\u8bf4weakmap\u662f\u4e0d\u53ef\u8fed\u4ee3\u7684\uff0c\u53ea\u80fd\u8fdb\u884c\u4e00\u4e9b\u201c\u589e\u5220\u6539\u67e5\u201d\u7684\u64cd\u4f5c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u53ef\u904d\u5386\u7684\u4e3b\u8981\u539f\u56e0\u662f\uff0c\u7531\u4e8eweakmap\u7684\u9879\u662f\u4e00\u79cd\u5f31\u5f15\u7528 <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u5f15\u7528\u5bf9\u8c61\u88ab\u5220\u9664\u65f6<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">weakmap\u4e2d\u7684\u5f15\u7528\u4e5f\u4f1a\u88ab\u5220\u9664\uff0c\u6240\u4ee5weakmap\u4e0d\u53ef\u904d\u5386<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9996\u5148\u8981\u77e5\u9053\uff0c\u5728JS\u56de\u6536\u673a\u5236\uff0c\u5f53\u5806\u6808\u4e0d\u518d\u88ab\u5f15\u7528\u7684\u65f6\u5019\uff0c\u6d4f\u89c8\u5668\u5185\u6838\u4f1a\u81ea\u52a8\u56de\u6536\u8fd9\u4e2a\u6570\u636e \u5f53\u4f7f\u7528map\u7684\u65f6\u5019\u4f1a\u89e6\u53d1\u4e00\u4e2a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-355","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"http:\/\/iwebg.cn\/index.php\/wp-json\/wp\/v2\/posts\/355","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=355"}],"version-history":[{"count":3,"href":"http:\/\/iwebg.cn\/index.php\/wp-json\/wp\/v2\/posts\/355\/revisions"}],"predecessor-version":[{"id":376,"href":"http:\/\/iwebg.cn\/index.php\/wp-json\/wp\/v2\/posts\/355\/revisions\/376"}],"wp:attachment":[{"href":"http:\/\/iwebg.cn\/index.php\/wp-json\/wp\/v2\/media?parent=355"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/iwebg.cn\/index.php\/wp-json\/wp\/v2\/categories?post=355"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/iwebg.cn\/index.php\/wp-json\/wp\/v2\/tags?post=355"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}