{"id":1920,"date":"2023-03-25T14:26:38","date_gmt":"2023-03-25T06:26:38","guid":{"rendered":""},"modified":"2023-03-25T14:26:38","modified_gmt":"2023-03-25T06:26:38","slug":"ES6 Set","status":"publish","type":"post","link":"https:\/\/bianchenghao6.com\/1920.html","title":{"rendered":"ES6 Set"},"content":{"rendered":"


\n <\/head>
\n <\/p>\n

\n

ES6 Set<\/h1>\n<\/p><\/div>\n

ES6 Set<\/h2>\n
\n \u96c6\u5408\u662f\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u5141\u8bb8\u60a8\u521b\u5efa\u552f\u4e00\u503c\u7684\u96c6\u5408\u3002\u96c6\u5408\u662f\u5904\u7406\u5355\u4e2a\u5bf9\u8c61\u6216\u5355\u4e2a\u503c\u7684\u96c6\u5408\u3002\n <\/div>\n
\n \u96c6\u5408\u662f\u7c7b\u4f3c\u4e8e\u6570\u7ec4\u7684\u503c\u96c6\u5408\uff0c\u4f46\u4e0d\u5305\u542b\u4efb\u4f55\u91cd\u590d\u9879\u3002\u5b83\u5141\u8bb8\u6211\u4eec\u5b58\u50a8\u552f\u4e00\u503c\u3002\u5b83\u652f\u6301\u539f\u59cb\u503c\u548c\u5bf9\u8c61\u5f15\u7528\u3002\n <\/div>\n
\n \u4e0e\u6620\u5c04\u7c7b\u4f3c\uff0c\u96c6\u5408\u4e5f\u662f\u6709\u5e8f\u7684\uff0c\u5373\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u6309\u5176\u63d2\u5165\u987a\u5e8f\u8fed\u4ee3\u3002\u5b83\u8fd4\u56de\u96c6\u5408\u5bf9\u8c61\u3002\n <\/div>\n

\u8bed\u6cd5<\/h3>\n
\n
var <\/span>s = new <\/span>Set(\"val1\"<\/span>,\"val2\"<\/span>,\"val3\"<\/span>);<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8ba9\u6211\u4eec\u901a\u8fc7\u4e0b\u9762\u7684\u4f8b\u5b50\u6765\u7406\u89e3set\u7684\u6982\u5ff5:\n  <\/div>\n
\u4f8b\u5b50<\/h3>\n
\n
let colors = new <\/span>Set(['Green'<\/span>, 'Red'<\/span><\/span>, 'Orange'<\/span>, 'Yellow'<\/span>, 'Red']);\nconsole.log<\/span>(colors);<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u96c6\u5408\u7684\u6240\u6709\u5143\u7d20\u5fc5\u987b\u662f\u552f\u4e00\u7684\u3002\u56e0\u6b64\uff0c\u4e0a\u9762\u4f8b\u5b50\u4e2d\u7684 colors \u96c6\u5408\u53ea\u5305\u542b\u56db\u4e2a\u4e0d\u540c\u7684\u5143\u7d20\u3002\u6210\u529f\u6267\u884c\u4e0a\u8ff0\u4ee3\u7801\u540e\uff0c\u6211\u4eec\u5c06\u5f97\u5230\u4ee5\u4e0b\u8f93\u51fa\u3002\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
Set { 'Green'<\/span>, 'Red'<\/span>, 'Orange'<\/span>, 'Yellow'<\/span> }<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8ba9\u6211\u4eec\u770b\u770bSet\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\n  <\/div>\n
Set Properties<\/h2>\n\n\n\n\n
\u5c5e\u6027<\/td>\n\u8bf4\u660e<\/td>\n<\/tr>\n
Set.size<\/td>\n\u6b64\u5c5e\u6027\u8fd4\u56de\u8bbe\u7f6e\u5bf9\u8c61\u4e2d\u7684\u503c\u6570\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Set.size<\/h3>\n
\n    Set \u5bf9\u8c61\u7684\u8fd9\u4e2a\u5c5e\u6027\u8fd4\u56de\u8868\u793a Set \u5bf9\u8c61\u4e2d\u5143\u7d20\u6570\u91cf\u7684\u503c\u3002\n  <\/div>\n
\n    \u793a\u4f8b\n  <\/div>\n
\n
let colors = new <\/span>Set(['Green'<\/span>, 'Red'<\/span><\/span>, 'Orange'<\/span>, 'Yellow'<\/span>, 'Red']);\nconsole.log<\/span>(colors.size);\nconsole.log<\/span>(colors);<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
4\nSet { 'Green'<\/span>, 'Red'<\/span>, 'Orange'<\/span>, 'Yellow'<\/span> }<\/pre>\n
<\/code>\n  <\/div>\n
Set Methods<\/h2>\n
\n    set \u5bf9\u8c61\u5305\u62ec\u51e0\u4e2a\u65b9\u6cd5\uff0c\u5217\u8868\u5982\u4e0b:\n  <\/div>\n\n\n\n\n\n\n\n\n\n\n
\u65b9\u6cd5<\/td>\n\u8bf4\u660e<\/td>\n<\/tr>\n
Set.prototype.add(value)<\/td>\n\u5b83\u5c06\u4e00\u4e2a\u65b0\u5143\u7d20\u9644\u52a0\u5230 set \u5bf9\u8c61\u7684\u7ed9\u5b9a\u503c\u4e0a\u3002<\/td>\n<\/tr>\n
Set.prototype.clear()<\/td>\n\u5b83\u4ece\u96c6\u5408\u5bf9\u8c61\u4e2d\u5220\u9664\u6240\u6709\u5143\u7d20\u3002<\/td>\n<\/tr>\n
Set.prototype.delete(value)<\/td>\n\u5b83\u5220\u9664\u4e0e\u76f8\u5e94\u503c\u5173\u8054\u7684\u5143\u7d20\u3002<\/td>\n<\/tr>\n
Set.prototype.entries()<\/td>\n\u5b83\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u8fed\u4ee3\u5668\u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u5305\u542b\u4e00\u4e2a\u6309\u63d2\u5165\u987a\u5e8f\u6392\u5217\u7684Set\u5bf9\u8c61\u4e2d\u6bcf\u4e2a\u5143\u7d20\u7684\u6570\u7ec4\u3002<\/td>\n<\/tr>\n
Set.prototype.forEach(callbackFn[, thisArg])<\/td>\n\u5b83\u6267\u884c\u4e00\u6b21\u56de\u8c03\u51fd\u6570\u3002<\/td>\n<\/tr>\n
Set.prototype.has(value)<\/td>\n\u5f53\u4f20\u9012\u7684\u503c\u5728 Set \u4e2d\u65f6\uff0c\u6b64\u65b9\u6cd5\u8fd4\u56de true\u3002 <\/td>\n<\/tr>\n
Set.prototype.values()<\/td>\n\u5b83\u8fd4\u56de\u65b0\u7684\u8fed\u4ee3\u5668\u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u5305\u542b Set \u4e2d\u6bcf\u4e2a\u5143\u7d20\u7684\u503c\uff0c\u6309\u63d2\u5165\u987a\u5e8f\u6392\u5217\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n    \u73b0\u5728\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u4e86\u89e3Set\u5bf9\u8c61\u7684\u4e0a\u8ff0\u65b9\u6cd5\u3002\n  <\/div>\n
Set.prototype.add(value)<\/h3>\n
\n    \u6b64\u65b9\u6cd5\u7528\u4e8e\u5c06\u5177\u6709\u73b0\u6709\u503c\u7684\u65b0\u5143\u7d20\u9644\u52a0\u5230 Set \u5bf9\u8c61\u3002\n  <\/div>\n
\n    \u793a\u4f8b\n  <\/div>\n
\n
let colors = new <\/span>Set(['Green'<\/span>, 'Red'<\/span><\/span>, 'Orange'<\/span>, 'Yellow'<\/span>, 'Red']);\ncolors.add<\/span>('Violet'<\/span><\/span>);\ncolors.add<\/span>('Indigo'<\/span>);\ncolors.add<\/span>('Blue'<\/span>);\ncolors.add<\/span>('Violet');\nconsole.log<\/span>(colors.size);\nconsole.log<\/span>(colors);<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
7\nSet { 'Green'<\/span>, 'Red'<\/span>, 'Orange'<\/span>, 'Yellow'<\/span>, 'Violet'<\/span>, 'Indigo'<\/span>, 'Blue'<\/span> }<\/pre>\n
<\/code>\n  <\/div>\n
Set.prototype.clear()<\/h3>\n
\n    \u5b83\u6e05\u9664\u96c6\u5408\u4e2d\u7684\u6240\u6709\u5bf9\u8c61\u3002\n  <\/div>\n
\n    \u793a\u4f8b\n  <\/div>\n
\n
let colors = new <\/span>Set(['Green'<\/span>, 'Red'<\/span><\/span>, 'Orange'<\/span>, 'Yellow'<\/span>, 'Red']);\ncolors.add<\/span>('Violet'<\/span><\/span>);\ncolors.add<\/span>('Indigo'<\/span>);\ncolors.add<\/span>('Blue'<\/span>);\ncolors.add<\/span>('Violet');\ncolors.clear<\/span>()\nconsole.log<\/span>(colors.size);<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
0<\/pre>\n
<\/code>\n  <\/div>\n
Set.prototype.delete(value)<\/h3>\n
\n    \u8be5\u65b9\u6cd5\u7528\u4e8e\u4eceset\u5bf9\u8c61\u4e2d\u79fb\u9664\u5bf9\u5e94\u7684\u4f20\u5165\u503c\u3002\n  <\/div>\n
\n    \u793a\u4f8b\n  <\/div>\n
\n
let colors = new <\/span>Set(['Green'<\/span>, 'Red'<\/span><\/span>, 'Orange'<\/span>, 'Yellow'<\/span>, 'Red']);\ncolors.add<\/span>('Violet'<\/span><\/span><\/span>);\ncolors.add<\/span>('Indigo'<\/span>);\ncolors.add<\/span>('Blue'<\/span>);\ncolors.add<\/span>('Violet');\ncolors.delete<\/span>('Violet');\nconsole.log<\/span>(colors.size);\nconsole.log<\/span>(colors);<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
6\nSet { 'Green'<\/span>, 'Red'<\/span>, 'Orange'<\/span>, 'Yellow'<\/span>, 'Indigo'<\/span>, 'Blue'<\/span> }<\/pre>\n
<\/code>\n  <\/div>\n
Set.prototype.entries()<\/h3>\n
\n    \u5b83\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u96c6\u5408\u8fed\u4ee3\u5668\u7684\u5bf9\u8c61\u3002\u5b83\u5305\u542b\u6bcf\u4e2a\u5143\u7d20\u7684\u503c\u6570\u7ec4\u3002\u5b83\u7ef4\u62a4\u63d2\u5165\u987a\u5e8f\u3002\n  <\/div>\n
\n    \u793a\u4f8b\n  <\/div>\n
\n
let colors = new <\/span>Set(['Green'<\/span>, 'Red'<\/span><\/span>, 'Orange'<\/span>, 'Yellow'<\/span>, 'Red']);\ncolors.add<\/span>('Violet'<\/span><\/span>);\ncolors.add<\/span>('Indigo'<\/span>);\ncolors.add<\/span>('Blue'<\/span>);\ncolors.add<\/span>('Violet');\nvar <\/span>itr = colors.entries<\/span>();\nfor(i=0;i<colors.size;i++)  {\n    console.log<\/span>(itr.next<\/span>().value); \n}<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
[ 'Green'<\/span><\/span>, 'Green' ]\n[ 'Red'<\/span><\/span>, 'Red' ]\n[ 'Orange'<\/span><\/span>, 'Orange' ]\n[ 'Yellow'<\/span><\/span>, 'Yellow' ]\n[ 'Violet'<\/span><\/span>, 'Violet' ]\n[ 'Indigo'<\/span><\/span>, 'Indigo' ]\n[ 'Blue'<\/span><\/span>, 'Blue' ]<\/pre>\n
<\/code>\n  <\/div>\n
Set.prototype.forEach(callbackFn[, thisArg])<\/h3>\n
\n    \u5b83\u4e3a\u6bcf\u4e2aMap\u6761\u76ee\u6267\u884c\u4e00\u6b21\u6307\u5b9a\u7684\u56de\u8c03\u51fd\u6570\u3002\n  <\/div>\n
\n    \u793a\u4f8b\n  <\/div>\n
\n
let colors = new <\/span>Set(['Green'<\/span>, 'Red'<\/span><\/span>, 'Orange'<\/span>, 'Yellow'<\/span>, 'Red']);\ncolors.add<\/span>('Violet'<\/span><\/span>);\ncolors.add<\/span>('Indigo'<\/span>);\ncolors.add<\/span>('Blue'<\/span>);\ncolors.add<\/span>('Violet');\nfunction details(values){\n    console.log<\/span>(values);\n}\ncolors.forEach<\/span>(details);<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
Green\nRed\nOrange\nYellow\nViolet\nIndigo\nBlue<\/pre>\n
<\/code>\n  <\/div>\n
Set.prototype.has(value)<\/h3>\n
\n    \u5b83\u8fd4\u56de\u5e03\u5c14\u503c\uff0c\u8be5\u503c\u6307\u793a\u8be5\u5143\u7d20\u4ee5\u53ca\u76f8\u5e94\u7684\u503c\u662f\u5426\u5b58\u5728\u4e8e Set \u5bf9\u8c61\u4e2d\u3002\n  <\/div>\n
\n    \u793a\u4f8b\n  <\/div>\n
\n
let colors = new <\/span>Set(['Green'<\/span>, 'Red'<\/span><\/span>, 'Orange'<\/span>, 'Yellow'<\/span>, 'Red']);\ncolors.add<\/span>('Violet'<\/span><\/span><\/span>);\ncolors.add<\/span>('Indigo'<\/span><\/span>);\ncolors.add<\/span>('Blue'<\/span>);\ncolors.add<\/span>('Violet');\nconsole.log<\/span>(colors.has<\/span>('Indigo'));\nconsole.log<\/span>(colors.has<\/span>('Violet'));\nconsole.log<\/span>(colors.has<\/span>('Cyan'<\/span>));<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
   true<\/span><\/span>\ntrue\nfalse<\/pre>\n
<\/code>\n  <\/div>\n
Set.prototype.values()<\/h3>\n
\n    \u5b83\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u8fed\u4ee3\u5668\u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u5305\u62ec\u6309\u63d2\u5165\u987a\u5e8f\u6392\u5217\u7684 Set \u5bf9\u8c61\u4e2d\u6bcf\u4e2a\u5143\u7d20\u7684\u503c\u3002\n  <\/div>\n
\n    \u793a\u4f8b\n  <\/div>\n
\n
let colors = new <\/span>Set(['Green'<\/span>, 'Red'<\/span><\/span>, 'Orange'<\/span>, 'Yellow'<\/span>, 'Red']);\ncolors.add<\/span>('Violet'<\/span>);\nvar <\/span>val = colors.values<\/span>();\nconsole.log<\/span>(val.next<\/span>().value); \nconsole.log<\/span>(val.next<\/span>().value); \nconsole.log<\/span>(val.next<\/span>().value); \nconsole.log<\/span>(val.next<\/span>().value); \nconsole.log<\/span>(val.next<\/span>().value);<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
Green\nRed\nOrange\nYellow\nViolet<\/pre>\n
<\/code>\n  <\/div>\n
Weak Set<\/h2>\n
\n    \u7528\u4e8e\u5b58\u50a8\u5bf9\u8c61\u7684\u96c6\u5408\u3002\u5b83\u7c7b\u4f3c\u4e8e Set \u5bf9\u8c61\uff0c\u56e0\u6b64\u5b83\u4e5f\u4e0d\u80fd\u5b58\u50a8\u91cd\u590d\u503c\u3002\u4e0e\u5f31\u6620\u5c04\u7c7b\u4f3c\uff0c\u5f31\u96c6\u4e0d\u80fd\u8fed\u4ee3\u3002\u5f31\u96c6\u53ea\u80fd\u5305\u542b\u53ef\u80fd\u88ab\u5783\u573e\u56de\u6536\u7684\u5bf9\u8c61\u3002\n  <\/div>\n
\n    \u5f31\u96c6\u4ec5\u5305\u62ecadd(value)\u3001delete(value)\u548chas(value) Set \u5bf9\u8c61\u7684\u65b9\u6cd5\u3002\n  <\/div>\n
\u793a\u4f8b<\/h3>\n
\n
'use strict'<\/span> \n   let ws = new <\/span>WeakSet();  \n   let obj = {msg:\"Welcome Back!\"<\/span>}; \n   ws.add<\/span>(obj); \n   console.log<\/span>(ws.has<\/span>(obj)); \n   ws.delete<\/span>(obj); \n   console.log<\/span>(ws.has<\/span>(obj));<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
   true<\/span><\/span>\nfalse<\/pre>\n
<\/code>\n  <\/div>\n
\u8fed\u4ee3\u5668<\/h2>\n
\n    \u8fed\u4ee3\u5668\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5b83\u5728\u7ec8\u6b62\u65f6\u5b9a\u4e49\u5e8f\u5217\u548c\u8fd4\u56de\u503c\u3002\u5b83\u5141\u8bb8\u4e00\u6b21\u8bbf\u95ee\u4e00\u7ec4\u5bf9\u8c61\u3002 Set \u548c Map \u90fd\u5305\u542b\u8fd4\u56de\u8fed\u4ee3\u5668\u7684\u65b9\u6cd5\u3002\n  <\/div>\n
\n    \u8fed\u4ee3\u5668\u662f\u5e26\u6709 next() \u65b9\u6cd5\u7684\u5bf9\u8c61\u3002\u5f53 next() \u65b9\u6cd5\u88ab\u8c03\u7528\u65f6\uff0c\u8fed\u4ee3\u5668\u8fd4\u56de\u4e00\u4e2a\u5bf9\u8c61\u4ee5\u53ca 'value' \u548c 'done' \u5c5e\u6027\u3002\n  <\/div>\n
\n    'done' \u662f\u4e00\u4e2a\u5e03\u5c14\u503c\uff0c\u5b83\u5728\u8bfb\u53d6\u96c6\u5408\u4e2d\u7684\u6240\u6709\u5143\u7d20\u540e\u8fd4\u56de true\u3002\u5426\u5219\uff0c\u5b83\u8fd4\u56de false\u3002\n  <\/div>\n
\n    \u8ba9\u6211\u4eec\u4e86\u89e3\u8fed\u4ee3\u5668\u548c Set \u5bf9\u8c61\u7684\u5b9e\u73b0\u3002\n  <\/div>\n
\u793a\u4f8b<\/h3>\n
\n
let colors = new <\/span>Set(['Green'<\/span>, 'Red'<\/span><\/span>, 'Orange'<\/span>, 'Yellow'<\/span>, 'Red']);\nvar <\/span>itr = colors.keys<\/span>();\nvar <\/span>itr1 = colors.entries<\/span>();\nvar <\/span>itr2 = colors.values<\/span>();\nconsole.log<\/span>(itr.next<\/span>());\nconsole.log<\/span>(itr1.next<\/span>());\nconsole.log<\/span>(itr2.next<\/span>());<\/pre>\n
<\/code>\n  <\/div>\n
\n    \u8f93\u51fa\n  <\/div>\n
\n
{ value: 'Green'<\/span><\/span><\/span><\/span>, done: false<\/span> <\/span>}\n{ value: [ 'Green', 'Green' ], done: false<\/span> <\/span>}\n{ value: 'Green', done: false<\/span> <\/span>}<\/pre>\n
<\/code>\n  <\/div>\n
 <\/body>
\n<\/html><\/p>\n","protected":false},"excerpt":{"rendered":"ES6 Setzh-cn","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[161],"tags":[],"class_list":["post-1920","post","type-post","status-publish","format-standard","hentry","category-es6jc"],"_links":{"self":[{"href":"https:\/\/bianchenghao6.com\/wp-json\/wp\/v2\/posts\/1920"}],"collection":[{"href":"https:\/\/bianchenghao6.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bianchenghao6.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bianchenghao6.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/bianchenghao6.com\/wp-json\/wp\/v2\/comments?post=1920"}],"version-history":[{"count":0,"href":"https:\/\/bianchenghao6.com\/wp-json\/wp\/v2\/posts\/1920\/revisions"}],"wp:attachment":[{"href":"https:\/\/bianchenghao6.com\/wp-json\/wp\/v2\/media?parent=1920"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bianchenghao6.com\/wp-json\/wp\/v2\/categories?post=1920"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bianchenghao6.com\/wp-json\/wp\/v2\/tags?post=1920"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}