--- 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">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">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">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">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">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">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>