## padStart + [link](./padStart "Link to this entry.") + [source](https://github.com/lodash/lodash/blob/4.5.0正式版/lodash.src.js#L12354 "View in source.") + [npm](https://www.npmjs.com/package/lodash.padstart "See the npm package.") ``` _.padStart([string=''], [length=0], [chars=' ']) ``` 如果字符串長度小于 length 則在左側填充字符。 如果超出長度則截斷超出的部分。 ### 參數 1. [string=''] (string) 要填充的字符串 2. [length=0] (number) 填充的長度 3. [chars=' '] (string) 填充字符 ### 返回值 (string) Returns 返回填充后的字符串 ### 示例 ``` _.padStart('abc', 6); // => ' abc' _.padStart('abc', 6, '_-'); // => '_-_abc' _.padStart('abc', 3); // => 'abc' ```