# \_.padStart（左侧填充字符）

**语法：**

```javascript
_.padStart([string=''], [length=0], [chars=' '])
```

**源代码链接：**[source](https://github.com/lodash/lodash/blob/4.17.10/lodash.js#L14442)

**npm包链接：**[npm package](https://www.npmjs.com/package/lodash.padstart)

**描述：**

如果`string`字符串长度小于`length`则在左侧填充字符。 如果超出`length`长度则截断超出的部分。

**开始版本：**4.0.0

**参数：**

* `[string=''] (string)`: 要填充的字符串。
* `[length=0] (number)`: 填充的长度。
* `[chars=' '] (string)`: 填充字符。 

**返回值：**

* `(string)`: 返回填充后的字符串。

**例子：**

```javascript
_.padStart('abc', 6);
// => '   abc'

_.padStart('abc', 6, '_-');
// => '_-_abc'

_.padStart('abc', 3);
// => 'abc'
```


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