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---
title: 严格不相等 (!==)
slug: Web/JavaScript/Reference/Operators/Strict_inequality
translation_of: Web/JavaScript/Reference/Operators/Strict_inequality
---
<div>{{jsSidebar("Operators")}}</div>
<p>严格不等式操作符(!==)检查它的两个对象是否不相等，返回一个布尔结果。与不等式运算符不同，严格不等式运算符总是认为不同类型的对象是不同的。</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>严格不等式运算符检查其对象是否不相等。它是严格相等运算符的否定，因此下面两行总是会给出相同的结果:</p>
<pre class="brush: js notranslate">x !== y
!(x === y)</pre>
<p>有关比较算法的详细信息，请参阅严格相等运算符的页面。</p>
<p>与严格相等运算符一样，严格不等运算符始终认为不同类型的对象是不同的:</p>
<pre class="brush: js notranslate">3 !== "3"; // true</pre>
<h2 id="示例">示例</h2>
<h3 id="比较相同类型的对象">比较相同类型的对象</h3>
<pre class="brush: js notranslate">console.log("hello" !== "hello"); // false
console.log("hello" !== "hola"); // true
console.log(3 !== 3); // false
console.log(3 !== 4); // true
console.log(true !== true); // false
console.log(true !== false); // true
console.log(null !== null); // false</pre>
<h3 id="比较不同类型的对象">比较不同类型的对象</h3>
<pre class="brush: js notranslate">console.log("3" !== 3); // true
console.log(true !== 1); // true
console.log(null !== undefined); // true</pre>
<h3 id="比较Object对象">比较Object对象</h3>
<pre class="brush: js notranslate">const object1 = {
name: "hello"
}
const object2 = {
name: "hello"
}
console.log(object1 !== object2); // true
console.log(object1 !== object1); // false</pre>
<h2 id="规范">规范</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">浏览器兼容</h2>
<p>{{Compat("javascript.operators.strict_inequality")}}</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_equality">Strict equality operator</a></li>
</ul>
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