From 218934fa2ed1c702a6d3923d2aa2cc6b43c48684 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:43:23 -0500
Subject: initial commit

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+---
+title: String.prototype.padStart()
+slug: Web/JavaScript/Reference/Global_Objects/String/padStart
+translation_of: Web/JavaScript/Reference/Global_Objects/String/padStart
+---
+<div>{{JSRef}}{{SeeCompatTable}}</div>
+
+<p><strong><code>padStart()</code></strong><code> 會將用給定用於填充的字串，以重複的方式，插入到目標字串的起頭(左側)，直到目標字串到達指定長度。</code></p>
+
+<h2 id="Syntax">Syntax</h2>
+
+<pre class="syntaxbox"><var>str</var>.padStart(<var>targetLength</var> [, <var>padString</var>])</pre>
+
+<h3 id="Parameters">Parameters</h3>
+
+<dl>
+ <dt><code>targetLength</code></dt>
+ <dd>目標字串被填充後的長度。如果此參數小於原字串的長度，那將直接返回原字串。</dd>
+ <dt><code>padString</code> {{optional_inline}}</dt>
+ <dd>用來填充的字串。如果填充字串太長，則由左側開始，擷取所需要的長度。此參數預設值是空白 " " (U+0020).</dd>
+</dl>
+
+<h3 id="Return_value">Return value</h3>
+
+<p>目標字串被填充到指定長度後，所得的新字串。</p>
+
+<h2 id="Examples">Examples</h2>
+
+<pre class="brush: js">'abc'.padStart(10);         // "       abc"
+'abc'.padStart(10, "foo");  // "foofoofabc"
+'abc'.padStart(6,"123465"); // "123abc"
+</pre>
+
+<h2 id="Specifications">Specifications</h2>
+
+<p>這個方法還沒有被納入 ECMAScript 標準。現在還只是個<a href="https://github.com/tc39/proposal-string-pad-start-end">提案</a>。</p>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Edge</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatChrome(57)}} </td>
+   <td>15</td>
+   <td>{{CompatGeckoDesktop(51)}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatOpera(44)}}</td>
+   <td>{{CompatSafari(10)}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Chrome for Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatChrome(57)}}</td>
+   <td>{{CompatGeckoMobile(51)}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatSafari(10)}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{jsxref("String.padEnd()")}}</li>
+</ul>
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