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+---
+title: String.prototype.concat()
+slug: Web/JavaScript/Reference/Global_Objects/String/concat
+tags:
+  - JavaScript
+  - Method
+  - Prototype
+  - String
+translation_of: Web/JavaScript/Reference/Global_Objects/String/concat
+---
+<div>{{JSRef}}</div>
+
+<p><strong><code>concat()</code></strong> 方法将一个或多个字符串与原字符串连接合并，形成一个新的字符串并返回。</p>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="notranslate"><code><var>str</var>.concat(<var>str2</var>, [, ...<var>strN</var>])</code></pre>
+
+<h3 id="Parameters" name="Parameters">参数</h3>
+
+<dl>
+ <dt><code><var>str2</var> [, ...<var>strN</var>]</code></dt>
+ <dd>需要连接到 <code><var>str</var></code> 的字符串。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>一个新的字符串，包含参数所提供的连接字符串。</p>
+
+<h2 id="Description" name="Description">描述</h2>
+
+<p><code>concat</code> 方法将一个或多个字符串与原字符串连接合并，形成一个新的字符串并返回。 <code>concat</code> 方法并不影响原字符串。</p>
+
+<p>如果参数不是字符串类型，它们在连接之前将会被转换成字符串。</p>
+
+<h2 id="性能" style="margin-bottom: 20px; line-height: 30px;">性能</h2>
+
+<p>强烈建议使用<a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Assignment_Operators">赋值操作符</a>（<code>+</code>, <code>+=</code>）代替 <code>concat</code> 方法。</p>
+
+<h2 id="Examples" name="Examples">示例</h2>
+
+<h3 id="Examples" name="Examples">使用 <code>concat</code></h3>
+
+<p>下面的例子演示如何将多个字符串与原字符串合并为一个新字符串</p>
+
+<pre class="brush: js notranslate">let hello = 'Hello, '
+console.log(hello.concat('Kevin', '. Have a nice day.'))
+// Hello, Kevin. Have a nice day.
+
+let greetList = ['Hello', ' ', 'Venkat', '!']
+"".concat(...greetList)  // "Hello Venkat!"
+
+"".concat({})    // [object Object]
+"".concat([])    // ""
+"".concat(null)  // "null"
+"".concat(true)  // "true"
+"".concat(4, 5)  // "45"</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-string.prototype.concat', 'String.prototype.concat')}}</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<p>{{Compat("javascript.builtins.String.concat")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Array.prototype.concat()")}}</li>
+ <li>{{jsxref("Operators/Assignment_Operators", "Assignment operators", "", 1)}}</li>
+</ul>