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docs(string): add trimStart()/trimEnd()

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ruanyf 2019-04-22 15:26:28 +08:00
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@ -331,7 +331,7 @@ ES2017 引入了字符串补全长度的功能。如果某个字符串不够指
## trimStart()，trimEnd()
ES2019 对字符串实例新增了`trimStart()`和`trimEnd()`这两个方法。它们的行为与`trim()`一致，`trimStart()`消除字符串头部的空格，`trimEnd()`消除尾部的空格。它们返回的都是新字符串，不会修改原始字符串。
[ES2019](https://github.com/tc39/proposal-string-left-right-trim) 对字符串实例新增了`trimStart()`和`trimEnd()`这两个方法。它们的行为与`trim()`一致，`trimStart()`消除字符串头部的空格，`trimEnd()`消除尾部的空格。它们返回的都是新字符串，不会修改原始字符串。
```javascript
const s = ' abc ';