{"id":155216,"date":"2024-05-08T11:48:34","date_gmt":"2024-05-08T03:48:34","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/155216.html"},"modified":"2024-05-08T11:48:39","modified_gmt":"2024-05-08T03:48:39","slug":"%e7%a7%bb%e5%8a%a8%e7%ab%af-ajax-%e5%a6%82%e4%bd%95%e6%93%8d%e4%bd%9c-javascript-%e5%af%b9%e8%b1%a1","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/155216.html","title":{"rendered":"\u79fb\u52a8\u7aef ajax \u5982\u4f55\u64cd\u4f5c JavaScript \u5bf9\u8c61"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/26213618\/d83a5d17-00e4-49be-94e4-507e1f0a2209.webp\" alt=\"\u79fb\u52a8\u7aef ajax \u5982\u4f55\u64cd\u4f5c JavaScript \u5bf9\u8c61\" \/><\/p>\n<p><p>\u79fb\u52a8\u7aef AJAX \u662f\u4e00\u79cd\u5728\u79fb\u52a8\u8bbe\u5907\u7684\u7f51\u9875\u5e94\u7528\u4e2d\u8fd0\u884c\u7684\u6280\u672f\uff0c\u5141\u8bb8\u7f51\u9875\u4e0e\u670d\u52a1\u5668\u5f02\u6b65\u901a\u4fe1\uff0c\u5373\u5728\u4e0d\u91cd\u65b0\u52a0\u8f7d\u6574\u4e2a\u9875\u9762\u7684\u60c5\u51b5\u4e0b\uff0c\u80fd\u591f\u66f4\u65b0\u90e8\u5206\u7f51\u9875\u7684\u6280\u672f\u3002JavaScript\u5bf9\u8c61\u7684\u64cd\u4f5c\u901a\u5e38\u6d89\u53ca\u521b\u5efa\u3001\u4fee\u6539\u6216\u5220\u9664\u5176\u5c5e\u6027\uff0c\u4ee5\u53ca\u8c03\u7528\u5bf9\u8c61\u65b9\u6cd5\u3002\u5177\u4f53\u64cd\u4f5c\u5305\u62ec<strong>\u521b\u5efa\u65b0\u5bf9\u8c61\u3001\u8bbf\u95ee\u5bf9\u8c61\u5c5e\u6027\u3001\u4fee\u6539\u5c5e\u6027\u503c\u3001\u68c0\u67e5\u5c5e\u6027\u5b58\u5728\u6027\u3001\u5220\u9664\u5c5e\u6027\u3001\u4ee5\u53ca\u4f7f\u7528\u65b9\u6cd5<\/strong>\u3002\u5728\u4f7f\u7528 AJAX \u66f4\u65b0\u6570\u636e\u65f6\uff0c\u901a\u5e38\u4f1a\u5904\u7406 JSON \u683c\u5f0f\u7684\u6570\u636e\uff0c\u8fd9\u4e9b\u6570\u636e\u5728\u5904\u7406\u524d\u540e\u90fd\u53ef\u80fd\u9700\u8981\u8fdb\u884c JavaScript \u5bf9\u8c61\u7684\u64cd\u4f5c\u3002<\/p>\n<\/p>\n<p><p><strong>\u521b\u5efa\u65b0\u5bf9\u8c61<\/strong>\uff0c\u53ef\u4ee5\u4f7f\u7528\u5b57\u9762\u91cf\u6216\u8005\u6784\u9020\u51fd\u6570\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">var myObject = {}; \/\/ \u7a7a\u5bf9\u8c61\u5b57\u9762\u91cf<\/p>\n<p>var myObject = new Object(); \/\/ \u4f7f\u7528\u6784\u9020\u51fd\u6570<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u53ef\u4ee5\u5bf9\u5bf9\u8c61\u6dfb\u52a0\u5c5e\u6027\u6216\u65b9\u6cd5\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">myObject.name = &quot;Example&quot;;<\/p>\n<p>myObject.sayHello = function() { return &quot;Hello&quot;; };<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u4ee5\u4e0b\u662f\u8be6\u7ec6\u7684\u64cd\u4f5c\u65b9\u6cd5\uff1a<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u521b\u5efaJavaScript\u5bf9\u8c61<\/h3>\n<\/p>\n<p><p>\u5728JavaScript\u4e2d\uff0c\u5bf9\u8c61\u53ef\u4ee5\u901a\u8fc7\u5b57\u9762\u91cf\u7684\u65b9\u5f0f\u76f4\u63a5\u521b\u5efa\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u6784\u9020\u51fd\u6570\u3002\u79fb\u52a8\u7aefAJAX\u5728\u5904\u7406\u6570\u636e\u65f6\u5e38\u5e38\u9700\u8981\u521b\u5efa\u5404\u79cd\u5bf9\u8c61\u6765\u5b58\u50a8\u4ece\u670d\u52a1\u5668\u7aef\u63a5\u6536\u5230\u7684\u6570\u636e\u3002<\/p>\n<\/p>\n<p><h4>1. \u4f7f\u7528\u5bf9\u8c61\u5b57\u9762\u91cf<\/h4>\n<\/p>\n<p><p>\u5b57\u9762\u91cf\u7684\u65b9\u6cd5\u662f\u6700\u7b80\u5355\u548c\u76f4\u89c2\u7684\uff0c\u4f60\u53ea\u9700\u7b80\u5355\u5217\u4e3e\u5bf9\u8c61\u4e2d\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">var person = {<\/p>\n<p>  name: &quot;John Doe&quot;,<\/p>\n<p>  age: 30,<\/p>\n<p>  greet: function() {<\/p>\n<p>    return &quot;Hi, my name is &quot; + this.name + &quot; and I am &quot; + this.age + &quot; years old.&quot;;<\/p>\n<p>  }<\/p>\n<p>};<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2. \u4f7f\u7528\u6784\u9020\u51fd\u6570<\/h4>\n<\/p>\n<p><p>\u6784\u9020\u51fd\u6570\u662f\u4e00\u4e2a\u666e\u901a\u7684\u51fd\u6570\uff0c\u4f46\u4f7f\u7528 <code>new<\/code> \u5173\u952e\u5b57\u6765\u8c03\u7528\u65f6\uff0c\u5b83\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">function Person(name, age) {<\/p>\n<p>  this.name = name;<\/p>\n<p>  this.age = age;<\/p>\n<p>  this.greet = function() {<\/p>\n<p>    return &quot;Hi, my name is &quot; + this.name + &quot; and I am &quot; + this.age + &quot; years old.&quot;;<\/p>\n<p>  };<\/p>\n<p>}<\/p>\n<p>var person = new Person(&quot;John Doe&quot;, 30);<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e8c\u3001\u8bbf\u95ee\u5bf9\u8c61\u5c5e\u6027<\/h3>\n<\/p>\n<p><h4>1. \u4f7f\u7528\u70b9\u7b26\u53f7\u8bbf\u95ee<\/h4>\n<\/p>\n<p><p>\u70b9\u7b26\u53f7\u662f\u6700\u5e38\u89c1\u7684\u8bbf\u95ee\u5c5e\u6027\u7684\u65b9\u5f0f\uff0c\u5176\u8bed\u6cd5\u7b80\u5355\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">var name = person.name; \/\/ &quot;John Doe&quot;<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2. \u4f7f\u7528\u65b9\u62ec\u53f7\u8bbf\u95ee<\/h4>\n<\/p>\n<p><p>\u65b9\u62ec\u53f7\u8bbf\u95ee\u53ef\u4ee5\u5728\u77e5\u9053\u5c5e\u6027\u540d\u7684\u60c5\u51b5\u4e0b\uff0c\u6216\u5c5e\u6027\u540d\u4e3a\u53d8\u91cf\u65f6\u4f7f\u7528\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">var propName = &quot;name&quot;;<\/p>\n<p>var age = person[&quot;age&quot;]; \/\/ 30<\/p>\n<p>var dynamicProperty = person[propName]; \/\/ &quot;John Doe&quot;<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e09\u3001\u4fee\u6539\u5c5e\u6027\u503c<\/h3>\n<\/p>\n<p><h4>1. \u76f4\u63a5\u8d4b\u503c<\/h4>\n<\/p>\n<p><p>\u4fee\u6539\u5bf9\u8c61\u7684\u5c5e\u6027\u503c\u6700\u7b80\u5355\u7684\u65b9\u6cd5\u662f\u76f4\u63a5\u8d4b\u503c\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">person.name = &quot;Jane Smith&quot;;<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2. \u4f7f\u7528Object.defineProperty()<\/h4>\n<\/p>\n<p><p>\u4f60\u4e5f\u53ef\u4ee5\u4f7f\u7528<code>Object.defineProperty()<\/code> \u65b9\u6cd5\u6765\u7cbe\u786e\u63a7\u5236\u5c5e\u6027\u7684\u884c\u4e3a\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">Object.defineProperty(person, &quot;name&quot;, {<\/p>\n<p>  value: &quot;Jane Smith&quot;,<\/p>\n<p>  writable: true,<\/p>\n<p>  enumerable: true,<\/p>\n<p>  configurable: true<\/p>\n<p>});<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u56db\u3001\u68c0\u67e5\u5c5e\u6027\u5b58\u5728\u6027<\/h3>\n<\/p>\n<p><h4>1. \u4f7f\u7528in\u64cd\u4f5c\u7b26<\/h4>\n<\/p>\n<p><p>\u53ef\u4ee5\u4f7f\u7528<code>in<\/code> \u5173\u952e\u5b57\u6765\u68c0\u67e5\u5bf9\u8c61\u662f\u5426\u5177\u6709\u67d0\u4e2a\u5c5e\u6027\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">if (&quot;name&quot; in person) {<\/p>\n<p>  \/\/ ...<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2. \u4f7f\u7528hasOwnProperty()\u65b9\u6cd5<\/h4>\n<\/p>\n<p><p><code>hasOwnProperty()<\/code> \u65b9\u6cd5\u4f1a\u68c0\u67e5\u5c5e\u6027\u662f\u5426\u5b58\u5728\u4e8e\u5bf9\u8c61\u672c\u8eab\uff0c\u800c\u4e0d\u67e5\u627e\u5176\u539f\u578b\u94fe\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">if (person.hasOwnProperty(&quot;name&quot;)) {<\/p>\n<p>  \/\/ ...<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e94\u3001\u5220\u9664\u5c5e\u6027<\/h3>\n<\/p>\n<p><h4>1. \u4f7f\u7528delete\u64cd\u4f5c\u7b26<\/h4>\n<\/p>\n<p><p>\u53ef\u4ee5\u4f7f\u7528<code>delete<\/code> \u64cd\u4f5c\u7b26\u6765\u5220\u9664\u5bf9\u8c61\u7684\u5c5e\u6027\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">delete person.age;<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2. \u76f4\u63a5\u8bbe\u7f6e\u4e3aundefined\u6216null<\/h4>\n<\/p>\n<p><p>\u5982\u679c\u4e0d\u60f3\u8ba9\u5c5e\u6027\u7559\u5728\u5bf9\u8c61\u4e2d\uff0c\u53ef\u4ee5\u95f4\u63a5\u7684\u628a\u5c5e\u6027\u503c\u8bbe\u7f6e\u4e3a <code>undefined<\/code> \u6216 <code>null<\/code>\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">person.age = undefined; \/\/ \u6216\u8005 person.age = null;<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u4e0d\u4f1a\u771f\u6b63\u5220\u9664\u5c5e\u6027\u4f46\u4f1a\u79fb\u9664\u5c5e\u6027\u7684\u503c\u3002<\/p>\n<\/p>\n<p><h3>\u516d\u3001\u4f7f\u7528\u5bf9\u8c61\u7684\u65b9\u6cd5<\/h3>\n<\/p>\n<p><p>\u5bf9\u8c61\u7684\u65b9\u6cd5\u662f\u4e0e\u5bf9\u8c61\u5173\u8054\u7684\u51fd\u6570\uff0c\u65b9\u6cd5\u53ef\u4ee5\u88ab\u8c03\u7528\u6765\u6267\u884c\u4e0e\u5bf9\u8c61\u76f8\u5173\u7684\u64cd\u4f5c\u3002<\/p>\n<\/p>\n<p><h4>1. \u8c03\u7528\u5bf9\u8c61\u7684\u65b9\u6cd5<\/h4>\n<\/p>\n<p><p>\u76f4\u63a5\u4f7f\u7528\u70b9\u7b26\u53f7\u6216\u65b9\u62ec\u53f7\u8bbf\u95ee\u6cd5\u6765\u8c03\u7528\u65b9\u6cd5\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">person.greet(); \/\/ \u4f7f\u7528\u70b9\u7b26\u53f7\u8c03\u7528<\/p>\n<p>person[&quot;greet&quot;](); \/\/ \u4f7f\u7528\u65b9\u62ec\u53f7\u8bbf\u95ee\u6cd5\u8c03\u7528<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2. \u6539\u53d8this\u7684\u6307\u5411<\/h4>\n<\/p>\n<p><p>\u6709\u65f6\u53ef\u80fd\u9700\u8981\u6539\u53d8\u65b9\u6cd5\u5185\u90e8<code>this<\/code>\u7684\u6307\u5411\uff0c\u53ef\u4ee5\u4f7f\u7528<code>call()<\/code>\u3001<code>apply()<\/code>\u6216<code>bind()<\/code> \u65b9\u6cd5\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">var welcome = person.greet.bind({name: &quot;Alice&quot;, age: 25});<\/p>\n<p>welcome(); \/\/ &quot;Hi, my name is Alice and I am 25 years old.&quot;<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u79fb\u52a8\u7aefAJAX\u64cd\u4f5c\u4e2d\uff0c\u7ecf\u5e38\u9700\u8981\u4f7f\u7528\u8fd9\u4e9bJavaScript\u5bf9\u8c61\u64cd\u4f5c\u6280\u5de7\u6765\u5904\u7406\u4ece\u670d\u52a1\u5668\u83b7\u53d6\u7684\u6570\u636e\u3002\u7406\u89e3\u5e76\u638c\u63e1\u8fd9\u4e9b\u57fa\u7840\u64cd\u4f5c\u662f\u8fdb\u884c\u79fb\u52a8\u7aef\u5f00\u53d1\u65f6\u4e0d\u53ef\u6216\u7f3a\u7684\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>1. \u79fb\u52a8\u7aef\u5982\u4f55\u4f7f\u7528 AJAX \u8bf7\u6c42\u5e76\u64cd\u4f5c JavaScript \u5bf9\u8c61\uff1f<\/strong><\/p>\n<p>\u5728\u79fb\u52a8\u7aef\uff0c\u4f7f\u7528 AJAX\uff08Asynchronous JavaScript and XML\uff09\u8bf7\u6c42\u6570\u636e\u5e76\u64cd\u4f5c JavaScript \u5bf9\u8c61\u975e\u5e38\u7b80\u5355\u3002\u4f60\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u6b65\u9aa4\u5b8c\u6210\u64cd\u4f5c\uff1a<\/p>\n<p>a. \u521b\u5efa\u4e00\u4e2a AJAX \u8bf7\u6c42\u5bf9\u8c61\uff0c\u6bd4\u5982 <code>var xhr = new XMLHttpRequest();<\/code>\u3002<\/p>\n<p>b. \u4f7f\u7528 <code>xhr.open()<\/code> \u65b9\u6cd5\u8bbe\u7f6e\u8bf7\u6c42\u7c7b\u578b\uff08GET \u6216 POST\uff09\u4ee5\u53ca\u8bf7\u6c42\u7684 URL\u3002<\/p>\n<p>c. \u4f7f\u7528 <code>xhr.send()<\/code> \u65b9\u6cd5\u53d1\u9001\u8bf7\u6c42\u3002<\/p>\n<p>d. \u5728 AJAX \u8bf7\u6c42\u6210\u529f\u540e\uff0c\u4f60\u53ef\u4ee5\u901a\u8fc7 <code>xhr.responseText<\/code> \u83b7\u53d6\u670d\u52a1\u5668\u8fd4\u56de\u7684\u6570\u636e\u3002<\/p>\n<p>e. \u5c06\u83b7\u53d6\u5230\u7684\u6570\u636e\u8f6c\u6362\u4e3a JavaScript \u5bf9\u8c61\uff0c\u5e76\u8fdb\u884c\u8fdb\u4e00\u6b65\u7684\u64cd\u4f5c\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528 <code>JSON.parse()<\/code> \u65b9\u6cd5\u5c06 JSON \u683c\u5f0f\u7684\u6570\u636e\u8f6c\u6362\u4e3a JavaScript \u5bf9\u8c61\u3002<\/p>\n<p>f. \u64cd\u4f5c JavaScript \u5bf9\u8c61\uff0c\u4fee\u6539\u3001\u6dfb\u52a0\u3001\u5220\u9664\u5c5e\u6027\u7b49\u3002<\/p>\n<p><strong>2. \u79fb\u52a8\u7aef\u5982\u4f55\u901a\u8fc7 AJAX \u8bf7\u6c42\u6570\u636e\u5e76\u64cd\u4f5c JavaScript \u5bf9\u8c61\u7684\u5c5e\u6027\uff1f<\/strong><\/p>\n<p>\u5982\u679c\u4f60\u53ea\u9700\u8981\u901a\u8fc7 AJAX \u8bf7\u6c42\u6570\u636e\u5e76\u64cd\u4f5c JavaScript \u5bf9\u8c61\u7684\u67d0\u4e2a\u5c5e\u6027\uff0c\u4f60\u53ef\u4ee5\u9075\u5faa\u4ee5\u4e0b\u6b65\u9aa4\uff1a<\/p>\n<p>a. \u521b\u5efa\u4e00\u4e2a AJAX \u8bf7\u6c42\u5bf9\u8c61\uff0c\u6bd4\u5982 <code>var xhr = new XMLHttpRequest();<\/code>\u3002<\/p>\n<p>b. \u4f7f\u7528 <code>xhr.open()<\/code> \u65b9\u6cd5\u8bbe\u7f6e\u8bf7\u6c42\u7c7b\u578b\uff08GET \u6216 POST\uff09\u4ee5\u53ca\u8bf7\u6c42\u7684 URL\u3002<\/p>\n<p>c. \u4f7f\u7528 <code>xhr.send()<\/code> \u65b9\u6cd5\u53d1\u9001\u8bf7\u6c42\u3002<\/p>\n<p>d. \u5728 AJAX \u8bf7\u6c42\u6210\u529f\u540e\uff0c\u4f60\u53ef\u4ee5\u901a\u8fc7 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