javascript - 检查字符串是否以某事开头？ [重复](Check if string begins with something? [duplicate])

Question

Possible Duplicate:(可能重复：)

Javascript StartsWith(Javascript StartsWith)

I know that I can do like ^= to see if an id starts with something, and I tried using that for this, but it didn't work... Basically, I'm retrieving the url and I want to set a class for an element for pathnames that start in a certain way...(我知道我可以这样做^ =看看id是否以某个东西开头，我尝试使用它，但它没有用......基本上，我正在检索网址，我想要设置一个类对于以某种方式开始的路径名的元素...)

So,(所以，) var pathname = window.location.pathname; //gives me /sub/1/train/yonks/459087 I want to make sure that for every path that starts with /sub/1, I can set a class for an element...(我想确保对于以/ sub / 1开头的每个路径，我可以为元素设置一个类......) if(pathname ^= '/sub/1') { //this didn't work... ...   ask by n00b0101 translate from so

Answer 1

Use stringObject.substring(使用stringObject.substring)

if (pathname.substring(0, 6) == "/sub/1") { // ... }