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+---
+title: 不等于 (!=)
+slug: Web/JavaScript/Reference/Operators/Inequality
+tags:
+  - JavaScript
+  - 参考
+  - 语言特征
+  - 运算符
+translation_of: Web/JavaScript/Reference/Operators/Inequality
+---
+<div>{{jsSidebar("Operators")}}</div>
+
+<p>不等于运算符 (<code>!=</code>) 检查其两个操作数是否不相等，并返回布尔结果。 与严格的不等式运算符不同，它尝试转换和比较不同类型的操作数。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/expressions-inequality.html")}}</div>
+
+<p class="hidden"><font><font>该交互式示例的源代码存储在GitHub存储库中。</font><font>如果您想为交互式示例项目做出贡献，请克隆</font></font><a href="https://github.com/mdn/interactive-examples"><font><font>https://github.com/mdn/interactive-examples</font></font></a><font><font>并向我们发送请求请求。</font></font></p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox notranslate">x != y</pre>
+
+<h2 id="描述"><font><font>描述</font></font></h2>
+
+<p><font><font>不等式运算符检查其操作数是否不相等。</font><font>这是</font></font><a href="https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Equality"><font><font>等于</font></font></a><font><font>运算符</font><font>的取反，</font><font>因此以下两行将始终给出相同的结果：</font></font> </p>
+
+<pre class="brush: js notranslate">x != y
+
+!(x == y)</pre>
+
+<p><font><font>有关比较算法的详细信息，请参见</font></font><a href="https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Equality"><font><font>等于</font></font></a><font><font>运算符</font><font>的页面</font><font>。</font></font></p>
+
+<p><font><font>与等于运算符一样，不等于运算符将尝试转换和比较不同类型的操作数：</font></font></p>
+
+<pre class="brush: js notranslate">3 != "3"; // false</pre>
+
+<p><font><font>为避免这种情况，并要求将不同类型视为不同，请使用</font></font><a href="https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Strict_inequality"><font><font>严格的不等于</font></font></a><font><font>运算符：</font></font></p>
+
+<pre class="brush: js notranslate">3 !== "3"; // true</pre>
+
+<h2 id="例子"><font><font>例子</font></font></h2>
+
+<h3 id="没有类型转换的比较"><font><font>没有类型转换的比较</font></font></h3>
+
+<pre class="brush: js notranslate">1 != 2;              // true
+"hello" != "hola";   // true
+
+1 != 1;              // false
+"hello" != "hello";  // false</pre>
+
+<h3 id="与类型转换比较"><font><font>与类型转换比较</font></font></h3>
+
+<pre class="brush: js notranslate">"1" !=  1;            // false
+1 != "1";             // false
+0 != false;           // false
+0 != null;            // true
+0 != undefined;       // true
+0 != !!null;          // false, look at Logical NOT operator
+0 != !!undefined;     // false, look at Logical NOT operator
+null != undefined;    // false
+
+const number1 = new Number(3);
+const number2 = new Number(3);
+number1 != 3;         // false
+number1 != number2;   // true</pre>
+
+<h3 id="对象比较"><font><font>对象比较</font></font></h3>
+
+<pre class="brush: js notranslate">const object1 = {"key": "value"}
+const object2 = {"key": "value"};
+
+object1 != object2 // true
+object2 != object2 // false</pre>
+
+<h2 id="规范"><font><font>规范</font></font></h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-equality-operators', 'Equality operators')}}</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性"><font><font>浏览器兼容性</font></font></h2>
+
+<div class="hidden"><font><font>此页面上的兼容性表是根据结构化数据生成的。</font><font>如果您想提供数据，请查看</font></font><a href="https://github.com/mdn/browser-compat-data"><font><font>https://github.com/mdn/browser-compat-data</font></font></a><font><font>并向我们发送请求请求。</font></font></div>
+
+<p>{{Compat("javascript.operators.inequality")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li><a href="https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Equality">Equality operator</a></li>
+ <li><a href="https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Strict_equality">Strict equality operator</a></li>
+ <li><a href="https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Strict_inequality">Strict inequality operator</a></li>
+</ul>
+
+<div id="gtx-trans" style="position: absolute; left: 16px; top: 1743.2px;">
+<div class="gtx-trans-icon"></div>
+</div>