{"id":161695,"date":"2024-05-08T13:57:09","date_gmt":"2024-05-08T05:57:09","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/161695.html"},"modified":"2024-05-08T13:57:12","modified_gmt":"2024-05-08T05:57:12","slug":"%e5%85%b3%e4%ba%8ejavascript%e5%af%b9%e8%b1%a1%e7%9a%84%e6%a6%82%e5%bf%b5","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/161695.html","title":{"rendered":"\u5173\u4e8eJavaScript\u5bf9\u8c61\u7684\u6982\u5ff5"},"content":{"rendered":"

\"\u5173\u4e8eJavaScript\u5bf9\u8c61\u7684\u6982\u5ff5\"<\/p>\n

JavaScript\u5bf9\u8c61\u662f\u4e00\u79cd\u590d\u5408\u503c\uff1a\u5b83\u662f\u5c5e\u6027\uff08Properties\uff09\u7684\u96c6\u5408\uff0c\u6bcf\u4e2a\u5c5e\u6027\u90fd\u662f\u7531\u4e00\u4e2a\u952e\uff08Key\uff09\u548c\u4e00\u4e2a\u503c\uff08Value\uff09\u7ec4\u6210\u7684\u3002\u5bf9\u8c61\u53ef\u4ee5\u88ab\u8ba4\u4e3a\u662f\u5b58\u50a8\u548c\u7ba1\u7406\u76f8\u5173\u6570\u636e\u7684\u5bb9\u5668<\/strong>\uff0c\u5b83\u65e2\u53ef\u4ee5\u5b58\u50a8\u57fa\u672c\u7c7b\u578b\u7684\u6570\u636e\uff08\u4f8b\u5982\u6570\u5b57\u3001\u5b57\u7b26\u4e32\uff09\u4e5f\u53ef\u4ee5\u5b58\u50a8\u590d\u5408\u7c7b\u578b\u7684\u6570\u636e\uff08\u4f8b\u5982\u51fd\u6570\u3001\u6570\u7ec4\u3001\u751a\u81f3\u662f\u5176\u4ed6\u5bf9\u8c61\uff09\u3002\u8fd9\u79cd\u7075\u6d3b\u6027\u4f7f\u5f97\u5bf9\u8c61\u5728JavaScript\u4e2d\u626e\u6f14\u7740\u975e\u5e38\u91cd\u8981\u7684\u89d2\u8272\u3002<\/p>\n<\/p>\n

\u5bf9\u8c61\u7684\u6838\u5fc3\u7279\u5f81\u4e4b\u4e00\u5c31\u662f\u53ef\u6269\u5c55\u6027<\/strong>\u3002\u4f60\u53ef\u4ee5\u968f\u65f6\u5411\u5bf9\u8c61\u6dfb\u52a0\u65b0\u7684\u5c5e\u6027\u6216\u8005\u5220\u9664\u73b0\u6709\u5c5e\u6027\uff0c\u8fd9\u4f7f\u5f97\u5bf9\u8c61\u6210\u4e3a\u4e86\u4e00\u4e2a\u975e\u5e38\u7075\u6d3b\u7684\u6570\u636e\u7ed3\u6784\u3002\u6bd4\u5982\uff0c\u4f60\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u7a7a\u5bf9\u8c61\uff0c\u7136\u540e\u6839\u636e\u9700\u8981\u52a8\u6001\u5730\u5411\u5176\u4e2d\u6dfb\u52a0\u5c5e\u6027\u548c\u65b9\u6cd5\u3002\u8fd9\u79cd\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6\u52a8\u6001\u4fee\u6539\u5bf9\u8c61\u7ed3\u6784\u7684\u80fd\u529b\uff0c\u4e3a\u5f00\u53d1\u8005\u63d0\u4f9b\u4e86\u6781\u5927\u7684\u4fbf\u5229\u548c\u7075\u6d3b\u6027\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u5bf9\u8c61\u7684\u521b\u5efa\u65b9\u6cd5<\/h2>\n<\/p>\n

JavaScript \u63d0\u4f9b\u4e86\u591a\u79cd\u65b9\u5f0f\u6765\u521b\u5efa\u5bf9\u8c61\uff0c\u6bcf\u79cd\u65b9\u5f0f\u90fd\u6709\u5176\u9002\u7528\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n

\u4f7f\u7528\u5bf9\u8c61\u5b57\u9762\u91cf<\/h3>\n<\/p>\n

\u6700\u7b80\u5355\u7684\u5bf9\u8c61\u521b\u5efa\u65b9\u6cd5\u662f\u4f7f\u7528\u5bf9\u8c61\u5b57\u9762\u91cf\uff0c\u8fd9\u53ea\u9700\u8981\u5728\u62ec\u53f7\u4e2d\u5b9a\u4e49\u5c5e\u6027\u540d\u79f0\u548c\u503c\u5373\u53ef\u3002<\/p>\n<\/p>\n

let person = {<\/p>\n
  name: "John Doe",<\/p>\n
  age: 30,<\/p>\n
  greet: function() {<\/p>\n
    console.log("Hello, " + this.name);<\/p>\n
  }<\/p>\n
};<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u975e\u5e38\u76f4\u63a5\u4e14\u6613\u4e8e\u7406\u89e3\uff0c\u975e\u5e38\u9002\u5408\u521b\u5efa\u7b80\u5355\u7684\u5bf9\u8c61\u3002<\/p>\n<\/p>\n
\u4f7f\u7528\u6784\u9020\u51fd\u6570<\/h3>\n<\/p>\n
\u6784\u9020\u51fd\u6570\u662f\u4e00\u79cd\u4f7f\u7528 new \u5173\u952e\u5b57\u6765\u521b\u5efa\u5bf9\u8c61\u7684\u65b9\u6cd5\u3002\u4f60\u53ef\u4ee5\u5b9a\u4e49\u4e00\u4e2a\u6784\u9020\u51fd\u6570\uff0c\u7136\u540e\u4f7f\u7528 new \u5173\u952e\u5b57\u6765\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5b9e\u4f8b\u3002<\/p>\n<\/p>\n
function Person(name, age) {<\/p>\n
  this.name = name;<\/p>\n
  this.age = age;<\/p>\n
  this.greet = function() {<\/p>\n
    console.log("Hello, " + this.name);<\/p>\n
  };<\/p>\n
}<\/p>\n
let person1 = new Person("Jane Doe", 28);<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u6784\u9020\u51fd\u6570\u9002\u7528\u4e8e\u521b\u5efa\u5177\u6709\u76f8\u540c\u5c5e\u6027\u548c\u65b9\u6cd5\u7684\u591a\u4e2a\u5bf9\u8c61\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u5bf9\u8c61\u5c5e\u6027\u7684\u8bbf\u95ee\u548c\u8bbe\u7f6e<\/h2>\n<\/p>\n
\u5bf9\u8c61\u7684\u5c5e\u6027\u53ef\u4ee5\u901a\u8fc7\u70b9\uff08.\uff09\u8bed\u6cd5\u6216\u8005\u65b9\u62ec\u53f7\uff08[]\uff09\u8bed\u6cd5\u6765\u8bbf\u95ee\u548c\u8bbe\u7f6e\u3002<\/p>\n<\/p>\n
\u70b9\u8bed\u6cd5<\/h3>\n<\/p>\n
\u70b9\u8bed\u6cd5\u662f\u6700\u7b80\u5355\u7684\u5c5e\u6027\u8bbf\u95ee\u65b9\u5f0f\uff0c\u76f4\u63a5\u4f7f\u7528\u5bf9\u8c61\u540d\u79f0\u540e\u8ddf\u70b9\uff0c\u518d\u8ddf\u5c5e\u6027\u540d\u3002<\/p>\n<\/p>\n
let person = {<\/p>\n
  name: "John",<\/p>\n
  age: 30<\/p>\n
};<\/p>\n
console.log(person.name); \/\/ \u8f93\u51fa John<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u65b9\u62ec\u53f7\u8bed\u6cd5<\/h3>\n<\/p>\n
\u65b9\u62ec\u53f7\u8bed\u6cd5\u5141\u8bb8\u4f7f\u7528\u5b57\u7b26\u4e32\u6765\u8bbf\u95ee\u5c5e\u6027\uff0c\u8fd9\u5728\u5c5e\u6027\u540d\u4e0d\u786e\u5b9a\u65f6\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/p>\n
let person = {<\/p>\n
  name: "John",<\/p>\n
  age: 30<\/p>\n
};<\/p>\n
console.log(person["name"]); \/\/ \u8f93\u51fa John<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001\u5bf9\u8c61\u7684\u904d\u5386<\/h2>\n<\/p>\n
\u904d\u5386\u5bf9\u8c61\u5c5e\u6027\u662f\u4e00\u79cd\u5e38\u89c1\u9700\u6c42\uff0cJavaScript \u63d0\u4f9b\u4e86\u591a\u79cd\u65b9\u5f0f\u6765\u5b9e\u73b0\u8fd9\u4e00\u70b9\u3002<\/p>\n<\/p>\n
\u4f7f\u7528 for…in \u5faa\u73af<\/h3>\n<\/p>\n
for…in \u5faa\u73af\u53ef\u4ee5\u904d\u5386\u4e00\u4e2a\u5bf9\u8c61\u7684\u6240\u6709\u53ef\u679a\u4e3e\u5c5e\u6027\u3002<\/p>\n<\/p>\n
let person = {<\/p>\n
  name: "John",<\/p>\n
  age: 30,<\/p>\n
  greet: function() {<\/p>\n
    console.log("Hello, " + this.name);<\/p>\n
  }<\/p>\n
};<\/p>\n
for (let key in person) {<\/p>\n
  console.log(key + ": " + person[key]);<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f7f\u7528 Object.keys() \u65b9\u6cd5<\/h3>\n<\/p>\n
Object.keys() \u65b9\u6cd5\u4f1a\u8fd4\u56de\u4e00\u4e2a\u6570\u7ec4\uff0c\u5305\u542b\u5bf9\u8c61\u81ea\u8eab\u7684\u6240\u6709\u53ef\u679a\u4e3e\u5c5e\u6027\u540d\u79f0\u3002<\/p>\n<\/p>\n
let person = {<\/p>\n
  name: "John",<\/p>\n
  age: 30<\/p>\n
};<\/p>\n
let keys = Object.keys(person);<\/p>\n
console.log(keys); \/\/ \u8f93\u51fa [ 'name', 'age' ]<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u56db\u3001\u5bf9\u8c61\u7684\u7ee7\u627f<\/h2>\n<\/p>\n
\u5728JavaScript\u4e2d\u5b9e\u73b0\u5bf9\u8c61\u95f4\u7684\u7ee7\u627f\u662f\u5e38\u89c1\u9700\u6c42\u3002\u7ee7\u627f\u5141\u8bb8\u4e00\u4e2a\u5bf9\u8c61\u83b7\u5f97\u53e6\u4e00\u4e2a\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
\u539f\u578b\u94fe\u7ee7\u627f<\/h3>\n<\/p>\n
\u6bcf\u4e2a\u5bf9\u8c61\u90fd\u6709\u4e00\u4e2a\u539f\u578b\u5bf9\u8c61\uff0c\u5728\u521b\u5efa\u5bf9\u8c61\u65f6\u4f1a\u5c06\u539f\u578b\u8d4b\u503c\u7ed9\u65b0\u5bf9\u8c61\u3002\u5229\u7528\u539f\u578b\u94fe\uff0c\u5bf9\u8c61\u53ef\u4ee5\u7ee7\u627f\u53e6\u4e00\u4e2a\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
function Person(name){<\/p>\n
  this.name = name;<\/p>\n
}<\/p>\n
Person.prototype.greet = function(){<\/p>\n
  console.log("Hello, " + this.name);<\/p>\n
}<\/p>\n
let person1 = new Person("John");<\/p>\n
person1.greet(); \/\/ \u8f93\u51fa Hello, John<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f7f\u7528 Object.create()<\/h3>\n<\/p>\n
Object.create() \u65b9\u6cd5\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u65b0\u5bf9\u8c61\uff0c\u4f7f\u7528\u73b0\u6709\u7684\u5bf9\u8c61\u6765\u63d0\u4f9b\u65b0\u521b\u5efa\u7684\u5bf9\u8c61\u7684__proto__<\/code>\u3002<\/p>\n<\/p>\n
let personProto = {<\/p>\n
  greet: function() {<\/p>\n
    console.log("Hello, " + this.name);<\/p>\n
  }<\/p>\n
};<\/p>\n
let person = Object.create(personProto);<\/p>\n
person.name = "John";<\/p>\n
person.greet(); \/\/ \u8f93\u51fa Hello, John<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e94\u3001\u9ad8\u7ea7\u4e3b\u9898<\/h2>\n<\/p>\n
\u5c01\u88c5\u548c\u9690\u85cf\u4fe1\u606f<\/h3>\n<\/p>\n
\u5c01\u88c5\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u6838\u5fc3\u539f\u5219\u4e4b\u4e00\uff0c\u5b83\u5141\u8bb8\u5c06\u5bf9\u8c61\u7684\u67d0\u4e9b\u7ec6\u8282\u9690\u85cf\u8d77\u6765\uff0c\u53ea\u66b4\u9732\u5fc5\u8981\u7684\u63a5\u53e3\u7ed9\u5916\u90e8\u4f7f\u7528\u3002\u5728JavaScript\u4e2d\uff0c\u5c01\u88c5\u901a\u5e38\u901a\u8fc7\u4f7f\u7528\u95ed\u5305\u6765\u5b9e\u73b0\u3002<\/p>\n<\/p>\n
\u4f7f\u7528\u4ee3\u7406\u548c\u53cd\u5c04<\/h3>\n<\/p>\n
ES6\u5f15\u5165\u4e86Proxy\u548cReflect\u5bf9\u8c61\uff0c\u63d0\u4f9b\u4e86\u521b\u5efa\u52a8\u6001\u4ee3\u7406\u7684\u80fd\u529b\u3002\u901a\u8fc7\u8fd9\u4e9b\u529f\u80fd\uff0c\u4f60\u53ef\u4ee5\u62e6\u622a\u548c\u5b9a\u4e49\u5bf9\u4e00\u4e2a\u5bf9\u8c61\u7684\u8bbf\u95ee\u3002<\/p>\n<\/p>\n
JavaScript\u5bf9\u8c61\u7684\u7075\u6d3b\u6027\u548c\u5f3a\u5927\u529f\u80fd\uff0c\u4f7f\u5176\u6210\u4e3a\u4e86\u5f00\u53d1\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\u3002\u7406\u89e3\u548c\u638c\u63e1JavaScript\u5bf9\u8c61\u7684\u4f7f\u7528\uff0c\u662f\u6210\u4e3a\u4e00\u540d\u9ad8\u6548JavaScript\u5f00\u53d1\u8005\u7684\u5173\u952e\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
JavaScript\u5bf9\u8c61\u662f\u4ec0\u4e48\u610f\u601d\uff1f<\/strong>  JavaScript\u5bf9\u8c61\u662f\u4e00\u79cd\u6570\u636e\u7c7b\u578b\uff0c\u5728JavaScript\u4e2d\uff0c\u51e0\u4e4e\u6240\u6709\u7684\u5185\u5bb9\u90fd\u662f\u4ee5\u5bf9\u8c61\u7684\u5f62\u5f0f\u5b58\u5728\u3002\u4e00\u4e2aJavaScript\u5bf9\u8c61\u662f\u7531\u5c5e\u6027\u548c\u65b9\u6cd5\u7ec4\u6210\u7684\uff0c\u5c5e\u6027\u662f\u5bf9\u8c61\u7684\u7279\u5f81\uff0c\u65b9\u6cd5\u662f\u5bf9\u8c61\u53ef\u4ee5\u6267\u884c\u7684\u52a8\u4f5c\u3002<\/p>\n
JavaScript\u5bf9\u8c61\u6709\u54ea\u4e9b\u5e38\u89c1\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\uff1f<\/strong> JavaScript\u5bf9\u8c61\u5177\u6709\u591a\u79cd\u5e38\u89c1\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002\u5e38\u89c1\u7684\u5c5e\u6027\u5305\u62ec\u5bf9\u8c61\u7684\u540d\u79f0\u3001\u7c7b\u578b\u3001\u957f\u5ea6\u7b49\u3002\u5e38\u89c1\u7684\u65b9\u6cd5\u5305\u62ec\u5bf9\u8c61\u7684\u521b\u5efa\u3001\u4fee\u6539\u3001\u5220\u9664\u7b49\u64cd\u4f5c\u3002\u6b64\u5916\uff0c\u5bf9\u8c61\u8fd8\u5177\u6709\u64cd\u4f5c\u5c5e\u6027\u3001\u8c03\u7528\u65b9\u6cd5\u3001\u8bbf\u95ee\u5bf9\u8c61\u5185\u90e8\u6570\u636e\u7b49\u7279\u70b9\u3002<\/p>\n
\u5982\u4f55\u521b\u5efa\u4e00\u4e2aJavaScript\u5bf9\u8c61\uff1f<\/strong> \u53ef\u4ee5\u4f7f\u7528JavaScript\u7684\u6784\u9020\u51fd\u6570\u6216\u8005\u5bf9\u8c61\u5b57\u9762\u91cf\u7684\u65b9\u5f0f\u6765\u521b\u5efa\u4e00\u4e2aJavaScript\u5bf9\u8c61\u3002\u4f7f\u7528\u6784\u9020\u51fd\u6570\u65b9\u5f0f\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u5173\u952e\u5b57new<\/code>\u6765\u5b9e\u4f8b\u5316\u4e00\u4e2a\u5bf9\u8c61\u3002\u4f8b\u5982\uff1avar obj = new Object();<\/code> \u4f7f\u7528\u5bf9\u8c61\u5b57\u9762\u91cf\u7684\u65b9\u5f0f\u65f6\uff0c\u76f4\u63a5\u4f7f\u7528\u82b1\u62ec\u53f7{}<\/code>\u58f0\u660e\u4e00\u4e2a\u5bf9\u8c61\u3002\u4f8b\u5982\uff1avar obj = {};<\/code> \u521b\u5efa\u5bf9\u8c61\u540e\uff0c\u53ef\u4ee5\u901a\u8fc7\u70b9\u6807\u8bb0\u6cd5\u6216\u8005\u65b9\u62ec\u53f7\u6807\u8bb0\u6cd5\u6765\u8bbf\u95ee\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"JavaScript\u5bf9\u8c61\u662f\u4e00\u79cd\u590d\u5408\u503c\uff1a\u5b83\u662f\u5c5e\u6027\uff08Properties\uff09\u7684\u96c6\u5408\uff0c\u6bcf\u4e2a\u5c5e\u6027\u90fd\u662f\u7531\u4e00\u4e2a\u952e\uff08Key\uff09\u548c […]","protected":false},"author":3,"featured_media":161698,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/161695"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=161695"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/161695\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/161698"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=161695"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=161695"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=161695"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}