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authorFlorian Merz <me@fiji-flo.de>2021-02-11 12:56:40 +0100
committerFlorian Merz <me@fiji-flo.de>2021-02-11 12:56:40 +0100
commit310fd066e91f454b990372ffa30e803cc8120975 (patch)
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----
-title: String.prototype.trimStart()
-slug: Web/JavaScript/Reference/Global_Objects/String/TrimLeft
-tags:
- - JavaScript
- - Method
- - Prototype
- - String
- - 参考
- - 字符串
- - 方法
-translation_of: Web/JavaScript/Reference/Global_Objects/String/trimStart
----
-<div>{{JSRef}}</div>
-
-<div><strong><code>trimStart()</code> </strong>方法从字符串的开头删除空格。<code>trimLeft()</code> 是此方法的别名。</div>
-
-<div>{{EmbedInteractiveExample("pages/js/string-trimstart.html")}}</div>
-
-
-
-<h2 id="语法">语法</h2>
-
-<pre class="syntaxbox"><var>str</var>.trimStart();
-<var>str</var>.trimLeft();</pre>
-
-<h3 id="返回值">返回值</h3>
-
-<p>一个新字符串,表示从其开头(左端)除去空格的调用字符串。</p>
-
-<h2 id="描述">描述</h2>
-
-<p><code>trimStart()</code> / <code>trimLeft()</code> 方法移除原字符串左端的连续空白符并返回一个新字符串,并不会直接修改原字符串本身。</p>
-
-<h3 id="别名">别名</h3>
-
-<p>为了与 {{jsxref("String.prototype.padStart")}} 等函数保持一致,标准方法名称为<code>trimStart</code>。 但是,出于 Web 兼容性原因,<code>trimLeft</code> 仍然是 <code>trimStart</code> 的别名。在某些引擎中,这意味着:</p>
-
-<pre class="brush: js">String.prototype.trimLeft.name === "trimStart";</pre>
-
-<h2 id="示例">示例</h2>
-
-<h3 id="使用_trimStart">使用 <code>trimStart()</code></h3>
-
-<p>下面的例子输出了小写的字符串 <code>"foo  "</code>:</p>
-
-<pre class="brush:js;highlight:[5]">var str = " foo ";
-
-console.log(str.length); // 8
-
-str = str.trimStart() // 等同于 str = str.trimLeft();
-console.log(str.length); // 5
-console.log(str); // "foo "
-</pre>
-
-<h2 id="规范">规范</h2>
-
-<table>
- <thead>
- <tr>
- <th scope="col">规范</th>
- <th scope="col">状态</th>
- <th scope="col">备注</th>
- </tr>
- </thead>
- <tbody>
- <tr>
- <td><code><a href="https://github.com/tc39/proposal-string-left-right-trim/#stringprototypetrimstart--stringprototypetrimend">String.prototype.{trimStart,trimEnd}</a></code>proposal</td>
- <td>Stage 4</td>
- <td>Expected to be part of ES2019</td>
- </tr>
- </tbody>
-</table>
-
-<h2 id="浏览器兼容性">浏览器兼容性</h2>
-
-<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
-
-<p>{{Compat("javascript.builtins.String.trimStart")}}</p>
-
-<h2 id="Polyfill">Polyfill</h2>
-
-<pre class="brush: js">// https://github.com/FabioVergani/js-Polyfill_String-trimStart
-
-(function(w){
- var String=w.String, Proto=String.prototype;
-
- (function(o,p){
- if(p in o?o[p]?false:true:true){
- var r=/^\s+/;
- o[p]=o.trimLeft||function(){
- return this.replace(r,'')
- }
- }
- })(Proto,'trimStart');
-
-})(window);
-
-
-/*
-ES6:
-(w=&gt;{
- const String=w.String, Proto=String.prototype;
-
- ((o,p)=&gt;{
- if(p in o?o[p]?false:true:true){
- const r=/^\s+/;
- o[p]=o.trimLeft||function(){
- return this.replace(r,'')
- }
- }
- })(Proto,'trimStart');
-
-})(window);
-*/</pre>
-
-<h2 id="参见">参见</h2>
-
-<ul>
- <li>{{jsxref("String.prototype.trim()")}}</li>
- <li>{{jsxref("String.prototype.trimEnd()")}}</li>
-</ul>