如何检查字符串“ StartsWith”是否为另一个字符串？

问题：

How would I write the equivalent of C#'s String.StartsWith in JavaScript? 如何在JavaScript中编写等效于C＃的String.StartsWith ？

var haystack = 'hello world';
var needle = 'he';

haystack.startsWith(needle) == true

Note: This is an old question, and as pointed out in the comments ECMAScript 2015 (ES6) introduced the .startsWith method. 注意：这是一个古老的问题，正如注释中指出的那样，ECMAScript 2015（ES6）引入了.startsWith方法。 However, at the time of writing this update (2015) browser support is far from complete . 但是，在撰写此更新（2015）时， 浏览器支持还远远没有完成 。

---

解决方案：

参考一： https://stackoom.com/question/2iDU/如何检查字符串-StartsWith-是否为另一个字符串
参考二： https://oldbug.net/q/2iDU/How-to-check-if-a-string-StartsWith-another-string

来源：oschina

链接：https://my.oschina.net/u/3797416/blog/4475771