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+---
+title: Strict equality (===)
+slug: Web/JavaScript/Reference/Operators/Strict_equality
+translation_of: Web/JavaScript/Reference/Operators/Strict_equality
+---
+<div>{{jsSidebar("Operators")}}</div>
+
+<p>全等运算符 (===) 会检查它的两个操作数是否相等，并且返回一个布尔值结果。与相等运算符不同，全等运算符总是认为不同类型的操作数是不同的。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/expressions-strict-equality.html")}}</div>
+
+<div class="hidden">The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone <a href="https://github.com/mdn/interactive-examples">https://github.com/mdn/interactive-examples</a> and send us a pull request.</div>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox notranslate">x === y</pre>
+
+<h2 id="描述">描述</h2>
+
+<p>全等运算符（<code>===</code>和 <code>!==</code>）使用<a class="external external-icon" href="http://www.ecma-international.org/ecma-262/5.1/#sec-11.9.6" rel="noopener">全等比较算法</a>来比较两个操作数。</p>
+
+<ul>
+ <li>如果操作数的类型不同，则返回 <code>false</code>。</li>
+ <li>如果两个操作数都是对象，只有当它们指向同一个对象时才返回 <code>true</code>。</li>
+ <li>如果两个操作数都为 <code>null</code>，或者两个操作数都为 <code>undefined</code>，返回 <code>true</code>。</li>
+ <li>如果两个操作数有任意一个为 <code>NaN</code>，返回 <code>false</code>。</li>
+ <li>否则，比较两个操作数的值：
+  <ul>
+   <li>数字类型必须拥有相同的数值。<code>+0</code> 和 <code>-0</code> 会被认为是相同的值。</li>
+   <li>字符串类型必须拥有相同顺序的相同字符。</li>
+   <li>布尔运算符必须同时为 <code>true</code> 或同时为 <code>false</code>。</li>
+  </ul>
+ </li>
+</ul>
+
+<p>全等运算符与<a href="/zh-CN/docs/Web/JavaScript/Reference/Operators/Equality">相等运算符</a>（<code>==</code>）最显著的区别是，如果操作数的类型不同，<code>== </code>运算符会在比较之前尝试将它们转换为相同的类型。</p>
+
+<h2 id="例子">例子</h2>
+
+<h3 id="比较相同类型的操作数">比较相同类型的操作数</h3>
+
+<pre class="brush: js notranslate">console.log("hello" === "hello");   // true
+console.log("hello" === "hola");    // false
+
+console.log(3 === 3);               // true
+console.log(3 === 4);               // false
+
+console.log(true === true);         // true
+console.log(true === false);        // false
+
+console.log(null === null);         // true</pre>
+
+<h3 id="比较不同类型的操作数">比较不同类型的操作数</h3>
+
+<pre class="brush: js notranslate">console.log("3" === 3);           // false
+
+console.log(true === 1);          // false
+
+console.log(null === undefined);  // false</pre>
+
+<h3 id="比较对象">比较对象</h3>
+
+<pre class="brush: js notranslate">const object1 = {
+  name: "hello"
+}
+
+const object2 = {
+  name: "hello"
+}
+
+console.log(object1 === object2);  // false
+console.log(object1 === object1);  // true</pre>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Specification</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-equality-operators', 'Equality operators')}}</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("javascript.operators.strict_equality")}}</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Operators/Equality">Equality operator</a></li>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Operators/Inequality">Inequality operator</a></li>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Operators/Strict_inequality">Strict inequality operator</a></li>
+</ul>