{"id":295,"date":"2023-08-02T16:18:26","date_gmt":"2023-08-02T08:18:26","guid":{"rendered":"https:\/\/iwebg.cn\/?p=295"},"modified":"2023-08-02T16:19:08","modified_gmt":"2023-08-02T08:19:08","slug":"vue3%e7%9a%84%e5%93%8d%e5%ba%94%e5%bc%8fapi","status":"publish","type":"post","link":"http:\/\/iwebg.cn\/index.php\/2023\/08\/02\/vue3%e7%9a%84%e5%93%8d%e5%ba%94%e5%bc%8fapi\/","title":{"rendered":"vue3\u7684\u54cd\u5e94\u5f0fapi"},"content":{"rendered":"\n

\u5728 Vue 3 \u4e2d\uff0c\u4f7f\u7528 Composition API \u6765\u521b\u5efa\u7ec4\u4ef6\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528 reactive<\/code>\u3001ref<\/code> \u548c computed<\/code> \u7b49\u54cd\u5e94\u5f0f API\u3002<\/p>\n\n\n\n

1.reactive\u51fd\u6570<\/h2>\n\n\n\n

\u25c6 Vue3<\/code> \u5f15\u5165\u4e86\u4e00\u4e2a reactive()<\/code> \u65b9\u6cd5\uff0c\u5176\u884c\u4e3a\u7c7b\u4f3c\u4e8e ref()<\/code>\uff0c\u4f46\u7528\u4e8e\u5bf9\u8c61\u3002<\/p>\n\n\n\n

\u25c6 reactive()<\/code> \u65b9\u6cd5\u7684\u4f5c\u7528\u662f\uff1a\u4e3a\u5bf9\u8c61\u7684\u5c5e\u6027\u589e\u52a0\u54cd\u5e94\u6027\u3002\u5728\u5bf9\u8c61\u4e0a\u8c03\u7528 reactive()<\/code>\uff0c\u5c31\u4f1a\u5f97\u5230\u4e00\u4e2a\u4ee3\u7406\u5bf9\u8c61\uff0c\u53ef\u4ee5\u4f7f\u7528 watchEffect()<\/code> \u76d1\u542c\u53d8\u5316\u3002<\/p>\n\n\n\n

import { reactive } from 'vue';\n\nconst state = reactive({\n  count: 0,\n  message: 'Hello, Vue 3!'\n});\n\nconsole.log(state.count); \/\/ \u8f93\u51fa 0\nconsole.log(state.message); \/\/ \u8f93\u51fa \"Hello, Vue 3!\"\n\n\/\/\u4f7f\u7528 reactive \u51fd\u6570\u5c06\u666e\u901a\u5bf9\u8c61 state \u8f6c\u6362\u4e3a\u54cd\u5e94\u5f0f\u5bf9\u8c61\u3002\n\/\/\u73b0\u5728\uff0c\u65e0\u8bba\u4f55\u65f6\u66f4\u6539 state \u5bf9\u8c61\u7684\u5c5e\u6027\uff0c\u76f8\u5173\u7684\u4f9d\u8d56\u90fd\u4f1a\u81ea\u52a8\u8ffd\u8e2a\u548c\u66f4\u65b0\u3002<\/code><\/pre>\n\n\n\n
2.ref\u51fd\u6570<\/h2>\n\n\n\n
\u25c6 ref<\/code>\uff1a\u7528\u4e8e\u5c06\u57fa\u672c\u7c7b\u578b\u6570\u636e\u5305\u88c5\u4e3a\u54cd\u5e94\u5f0f\u5bf9\u8c61\u3002<\/p>\n\n\n\n
\u25c6 ref<\/code>\u63a5\u53d7\u4e00\u4e2a\u5185\u90e8\u503c\u5e76\u8fd4\u56de\u4e00\u4e2a\u54cd\u5e94\u5f0f\u4e14\u53ef\u53d8\u7684 ref<\/code> \u5bf9\u8c61\u3002ref <\/code>\u5bf9\u8c61\u4ec5\u6709\u4e00\u4e2a .value property<\/code>\uff0c\u6307\u5411\u8be5\u5185\u90e8\u503c\u3002
\u25c6 ref<\/code> \u80fd\u5b9a\u4e49\u4efb\u4f55\u7c7b\u578b\u7684\u54cd\u5e94\u5f0f\u6570\u636e\uff0c\u53c2\u6570\u53ef\u4ee5\u4f20\u5165\u4efb\u610f\u6570\u636e\u7c7b\u578b\u3002\u5bf9\u4e8e\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0cref <\/code>\u901a\u8fc7value <\/code> \u5c5e\u6027\u8bbe\u7f6e setter <\/code>\u548c getter <\/code>\u5b9e\u73b0\u6570\u636e\u52ab\u6301\uff0c\u4f46\u5b83\u7684\u539f\u59cb\u6570\u636e\u4e0d\u4f1a\u53d1\u751f\u66f4\u6539\uff0c\u4e14\u6027\u80fd\u4f18\u4e8e reactive<\/code>\u3002\u800c\u5bf9\u4e8e\u5f15\u7528\u7c7b\u578b\uff0cref <\/code>\u4ecd\u7136\u662f\u901a\u8fc7 reactive <\/code>\u5305\u88c5\u5b9e\u73b0\u7684\uff1b<\/p>\n\n\n\n
\u25c6 ref <\/code>\u5b9a\u4e49\u7684\u53d8\u91cf\uff0c\u6539\u53d8\u503c\u8981 .value<\/code>\uff0c\u800c\u5728 template <\/code>\u4e2d\u4e0d\u7528\u5199 .value<\/code>\uff1b<\/p>\n\n\n\n
import { ref } from 'vue';\n\nconst count = ref(0);\nconsole.log(count.value); \/\/ \u8f93\u51fa 0\n\ncount.value++;\nconsole.log(count.value); \/\/ \u8f93\u51fa 1\n\n\/\/\u4f7f\u7528 ref \u51fd\u6570\u5c06\u57fa\u672c\u7c7b\u578b\u6570\u503c 0 \u5305\u88c5\u4e3a\u54cd\u5e94\u5f0f\u5bf9\u8c61 count\u3002\u901a\u8fc7\u8bbf\u95ee count.value \u6765\u83b7\u53d6\u548c\u4fee\u6539\u5176\u503c\u3002<\/code><\/pre>\n\n\n\n
3.toRefs\u51fd\u6570<\/h2>\n\n\n\n
\u25c6 toRefs<\/code><\/code>\uff1a\u5c06\u54cd\u5e94\u5f0f\u5bf9\u8c61\u8f6c\u6362\u4e3a\u666e\u901a\u5bf9\u8c61\uff0c\u4ee5\u4fbf\u5728\u6a21\u677f\u4e2d\u8bbf\u95ee\u54cd\u5e94\u5f0f\u6570\u636e\u3002<\/p>\n\n\n\n
\u25c6 toRefs <\/code>\u7528\u4e8e\u5c06\u54cd\u5e94\u5f0f\u5bf9\u8c61\u8f6c\u6362\u4e3a\u666e\u901a\u5bf9\u8c61\uff0c\u5176\u4e2d\u666e\u901a\u5bf9\u8c61\u7684\u6bcf\u4e2a\u5c5e\u6027\u90fd\u662f\u6307\u5411\u539f\u59cb\u5bf9\u8c61\u76f8\u5e94\u5c5e\u6027\u7684 ref\uff0c\u4e24\u8005\u4fdd\u6301\u5f15\u7528\u5173\u7cfb\uff1b<\/p>\n\n\n\n
\u25c6 toRefs <\/code>\u5e38\u7528\u4e8e ES6 \u7684\u89e3\u6784\u8d4b\u503c\u64cd\u4f5c\u3002\u4f46\u662f\uff0c\u5bf9\u4e00\u4e2a\u54cd\u5e94\u5f0f\u5bf9\u8c61\u76f4\u63a5\u89e3\u6784\u65f6\uff0c\u89e3\u6784\u540e\u7684\u6570\u636e\u5c06\u4e0d\u518d\u6709\u54cd\u5e94\u5f0f\uff0c\u800c\u4f7f\u7528 toRefs <\/code>\u53ef\u4ee5\u65b9\u4fbf\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff1b<\/p>\n\n\n\n
import { reactive, toRefs } from 'vue';\n\nconst state = reactive({\n  count: 0,\n  message: 'Hello, Vue 3!'\n});\n\nconst stateRefs = toRefs(state);\n\nexport default {\n  setup() {\n    return {\n      ...stateRefs\n    };\n  }\n};\n\n\/\/\u5c06\u54cd\u5e94\u5f0f\u5bf9\u8c61 state \u8f6c\u6362\u4e3a\u666e\u901a\u5bf9\u8c61 stateRefs\uff0c\u7136\u540e\u5c06\u5176\u4f5c\u4e3a\u8fd4\u56de\u503c\u4f20\u9012\u7ed9\u7ec4\u4ef6\u7684 setup \u51fd\u6570\u3002<\/code><\/pre>\n\n\n\n
4.toRef\u51fd\u6570<\/h2>\n\n\n\n
\u25c6 toRef<\/code>\uff1a\u53ef\u7528\u4e8e\u4e3a\u6e90 reactive<\/code> \u5bf9\u8c61\u4e0a\u7684\u5c5e\u6027\u521b\u5efa ref<\/code>\u3002\u521b\u5efa\u7684 ref<\/code> \u4e0e\u5176\u6e90\u5c5e\u6027\u540c\u6b65\uff1a\u6539\u53d8\u6e90\u5c5e\u6027\u5c06\u66f4\u65b0 ref<\/code>\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002<\/p>\n\n\n\n
\u25c6 toRef <\/code>\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\uff1a\u7b2c\u4e00\u4e2a\u53c2\u6570\u4e3a\u6e90\u5bf9\u8c61\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u6e90\u5bf9\u8c61\u4e2d\u7684\u5c5e\u6027\u540d\uff1b
\u83b7\u53d6\u6570\u636e\u503c\u7684\u65f6\u5019\u9700\u8981\u52a0 .value<\/code>\uff1b
\u25c6 \u4f7f\u7528\u573a\u666f\uff1a\u6709\u4e00\u4e2a\u54cd\u5e94\u5f0f\u5bf9\u8c61\u6570\u636e\uff0c\u4f46\u662f\u6a21\u7248\u4e2d\u53ea\u9700\u8981\u4f7f\u7528\u5176\u4e2d\u4e00\u9879\u6570\u636e\uff1b
\u25c6 toRef <\/code>\u8f6c\u5316\u540e\u751f\u6210\u7684 ref <\/code>\u6570\u636e\uff0c\u5982\u679c\u662f\u5f15\u7528\u7c7b\u578b\u6570\u636e\u65f6\uff0c\u90a3\u4e48\u5b83\u4e0d\u662f\u539f\u59cb\u6570\u636e\u7684\u62f7\u8d1d\uff0c\u800c\u662f\u539f\u59cb\u6570\u636e\u7684\u5f15\u7528\uff0c\u6539\u53d8\u5b83\u7684\u6570\u636e\u4e5f\u4f1a\u540c\u65f6\u6539\u53d8\u539f\u59cb\u6570\u636e\u3002<\/p>\n\n\n\n
const state = reactive({\n  foo: 1,\n  bar: 2\n})\n \nconst fooRef = toRef(state, 'foo')\n \nfooRef.value++\nconsole.log(state.foo) \/\/ 2\nconsole.log(unref(fooRef)) \/\/ 2\nstate.foo++\nconsole.log(unref(fooRef)) \/\/ 3<\/code><\/pre>\n\n\n\n
5.isReactive\u51fd\u6570<\/h2>\n\n\n\n
\u25c6 isReactive<\/code> \uff1aVue 3 Composition API \u4e2d\u7684\u4e00\u4e2a\u51fd\u6570\uff0c\u7528\u4e8e\u68c0\u67e5\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u662f\u54cd\u5e94\u5f0f\u7684,\u5b83\u63a5\u6536\u4e00\u4e2a\u5bf9\u8c61\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c\uff0c\u8868\u793a\u8be5\u5bf9\u8c61\u662f\u5426\u662f\u54cd\u5e94\u5f0f\u7684\u3002\u3002<\/p>\n\n\n\n
\u25c6 reactive<\/code> \u5305\u88c5\u4e00\u4e2a\u5bf9\u8c61\u65f6\uff0c\u5b83\u4f1a\u8fd4\u56de\u4e00\u4e2a\u4ee3\u7406\u5bf9\u8c61\uff0c\u8be5\u4ee3\u7406\u5bf9\u8c61\u4f1a\u8ddf\u8e2a\u5bf9\u8c61\u7684\u5c5e\u6027\u8bbf\u95ee\u548c\u4fee\u6539\uff0c\u5e76\u5728\u9700\u8981\u65f6\u89e6\u53d1\u76f8\u5e94\u7684\u66f4\u65b0\u3002<\/p>\n\n\n\n
import { reactive, isReactive } from 'vue';\n\nconst obj = reactive({\n  count: 0,\n  message: 'Hello, Vue 3!'\n});\n\nconsole.log(isReactive(obj)); \/\/ \u8f93\u51fa true<\/code><\/pre>\n\n\n\n
6.\u603b\u7ed3<\/h2>\n\n\n\n
\u25c6 ref<\/code>\u3001reactive<\/code>\u662f\u5728 setup()<\/code> \u58f0\u660e\u7ec4\u4ef6\u5185\u90e8\u72b6\u6001\u7528\u7684\uff0c \u8fd9\u4e9b\u53d8\u91cf\u901a\u5e38\u90fd\u8981 return \u51fa\u53bb\uff0c\u9664\u4e86\u4f9b < template ><\/code> \u6216\u6e32\u67d3\u51fd\u6570\u6e32\u67d3\u89c6\u56fe\uff0c\u4e5f\u53ef\u4ee5\u4f5c\u4e3a props <\/code>\u6216 emit <\/code>\u53c2\u6570 \u5728\u7ec4\u4ef6\u95f4\u4f20\u9012\u3002\u5b83\u4eec\u7684\u503c\u53d8\u66f4\u53ef\u89e6\u53d1\u9875\u9762\u6e32\u67d3\uff1b
\u25c6 toRef\u3001toRefs<\/code> \u7528\u4e8e\u5904\u7406 \u7ec4\u4ef6\/\u51fd\u6570 \u4f20\u9012\u7684\u54cd\u5e94\u5f0f\u6570\u636e\uff0c\u5982\uff1a\u5728\u63a5\u6536\u7236\u7ec4\u4ef6 props <\/code>\u65f6composables <\/code>\u7ec4\u5408\u5f0f\u51fd\u6570\u8fd4\u56de\u6570\u636e\u65f6\u5efa\u7acb\u8d77\u67d0\u4e9b\u5c5e\u6027\u7684\u54cd\u5e94\u5f0f\u5f15\u7528\uff1b
\u25c6 ref<\/code> \u5305\u88c5\u7684\u5c5e\u6027\u5728 setup <\/code>\u51fd\u6570\u5185\u90fd\u9700\u8981\u901a\u8fc7 .value<\/code> \u53bb\u8bbf\u95ee\u5b83\u503c ( template \u6a21\u7248\u5185\u4e0d\u7528 )\u3002\u56e0\u6b64\uff0cref\u3001toRef<\/code> \u521b\u5efa\u7684\u53d8\u91cf\u503c\u90fd\u9700\u8981\u7528\u53d8\u91cf .value<\/code> \u8bfb\u53d6\u3002reactive<\/code> \u5219\u4e0d\u7528\uff0c\u56e0\u4e3a\u4f1a\u81ea\u52a8\u89e3\u5305\u5206\u914d\u7ed9\u5b83\u7684 ref<\/code>\u3002
\u25c6 toRefs<\/code>\uff0c\u5982\u679c\u662f\u89e3\u6784\u8d4b\u503c\uff0c\u5982\uff1a const { state1, state2 } = toRefs(props)<\/code>\uff0c\u503c\u9700\u8981\u8fd9\u6837\u83b7\u53d6\uff1astate1.value.count<\/code>\uff1b
\u25c6 \u82e5\u6574\u4f53\u8d4b\u7ed9\u4e00\u4e2a\u53d8\u91cf\uff0c\u5982\uff1aconst state = toRefs(props)\uff0c<\/code>\u5219\u662f state.state1.value<\/code>\u3002
\u53ea\u6709 toRefs <\/code>\u53ef\u4ee5\u89e3\u6784\uff1b
\u4ee5\u4e0a\u56db\u79cd\u65b9\u5f0f\u58f0\u660e\u7684\u53d8\u91cf\u5728\u901a\u8fc7 props <\/code>\u6216 \u4e8b\u4ef6 \u4f20\u9012\u65f6\uff0c\u5747\u4f1a\u7ef4\u6301\u5176\u54cd\u5e94\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5728 Vue 3 \u4e2d\uff0c\u4f7f\u7528 Composition API \u6765\u521b\u5efa\u7ec4\u4ef6\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528 reactive\u3001ref \u548c […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[],"class_list":["post-295","post","type-post","status-publish","format-standard","hentry","category-10"],"_links":{"self":[{"href":"http:\/\/iwebg.cn\/index.php\/wp-json\/wp\/v2\/posts\/295","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=295"}],"version-history":[{"count":10,"href":"http:\/\/iwebg.cn\/index.php\/wp-json\/wp\/v2\/posts\/295\/revisions"}],"predecessor-version":[{"id":305,"href":"http:\/\/iwebg.cn\/index.php\/wp-json\/wp\/v2\/posts\/295\/revisions\/305"}],"wp:attachment":[{"href":"http:\/\/iwebg.cn\/index.php\/wp-json\/wp\/v2\/media?parent=295"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/iwebg.cn\/index.php\/wp-json\/wp\/v2\/categories?post=295"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/iwebg.cn\/index.php\/wp-json\/wp\/v2\/tags?post=295"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}