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+---
+title: String.prototype.padStart()
+slug: Web/JavaScript/Reference/Global_Objects/String/padStart
+tags:
+  - JavaScript
+  - Method
+  - Reference
+  - String
+translation_of: Web/JavaScript/Reference/Global_Objects/String/padStart
+---
+<div>{{JSRef}}</div>
+
+<p><strong><code>padStart()</code></strong> 메서드는 현재 문자열의 시작을 다른 문자열로 채워, 주어진 길이를 만족하는 새로운 문자열을 반환합니다. 채워넣기는 대상 문자열의 시작(좌측)부터 적용됩니다.</p>
+
+<p> </p>
+
+<div>{{EmbedInteractiveExample("pages/js/string-padstart.html")}}</div>
+
+
+
+<p> </p>
+
+<h2 id="구문">구문</h2>
+
+<pre class="syntaxbox"><var>str</var>.padStart(<var>targetLength</var> [, <var>padString</var>])</pre>
+
+<h3 id="매개변수">매개변수</h3>
+
+<dl>
+ <dt><code>targetLength</code></dt>
+ <dd>목표 문자열 길이. 현재 문자열의 길이보다 작다면 채워넣지 않고 그대로 반환.</dd>
+ <dt><code>padString</code> {{optional_inline}}</dt>
+ <dd>현재 문자열에 채워넣을 다른 문자열. 문자열이 너무 길어 목표 문자열 길이를 초과한다면 좌측 일부를 잘라서 넣음. 기본값은 " ". (U+0020)</dd>
+</dl>
+
+<h3 id="반환값">반환값</h3>
+
+<p>시작점부터 주어진 문자열로 채워 목표 길이를 만족하는 {{jsxref("String")}}.</p>
+
+<h2 id="예시">예시</h2>
+
+<pre class="brush: js">'abc'.padStart(10);         // "       abc"
+'abc'.padStart(10, "foo");  // "foofoofabc"
+'abc'.padStart(6,"123465"); // "123abc"
+'abc'.padStart(8, "0");     // "00000abc"
+'abc'.padStart(1);          // "abc"</pre>
+
+<h2 id="폴리필">폴리필</h2>
+
+<p>다른 모든 코드 이전에 아래 코드를 포함하면 지원하지 않는 플랫폼에서도 <code>String.prototype.padStart()</code> 메서드를 사용할 수 있습니다.</p>
+
+<pre class="brush: js">// https://github.com/uxitten/polyfill/blob/master/string.polyfill.js
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/padStart
+if (!String.prototype.padStart) {
+    String.prototype.padStart = function padStart(targetLength,padString) {
+        targetLength = targetLength&gt;&gt;0; //truncate if number or convert non-number to 0;
+        padString = String((typeof padString !== 'undefined' ? padString : ' '));
+        if (this.length &gt; targetLength) {
+            return String(this);
+        }
+        else {
+            targetLength = targetLength-this.length;
+            if (targetLength &gt; padString.length) {
+                padString += padString.repeat(targetLength/padString.length); //append to original to ensure we are longer than needed
+            }
+            return padString.slice(0,targetLength) + String(this);
+        }
+    };
+}
+</pre>
+
+<h2 id="명세">명세</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-string.prototype.padstart', 'String.prototype.padStart')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td>Initial definition in ECMAScript 2017.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES8', '#sec-string.prototype.padstart', 'String.prototype.padStart')}}</td>
+   <td>{{Spec2('ES8')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="브라우저_호환성">브라우저 호환성</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.padStart")}}</p>
+
+<h2 id="같이_보기">같이 보기</h2>
+
+<ul>
+ <li>{{jsxref("String.prototype.padEnd()")}}</li>
+</ul>