Check if string begins with something? [duplicate]
if (pathname.substring(0, 6) == "/sub/1") { // ...}
String.prototype.startsWith = function(needle){ return this.indexOf(needle) === 0;};
You can use string.match() and a regular expression for this too:
if(pathname.match(/^\/sub\/1/)) { // you need to escape the slashes
string.match()
will return an array of matching substrings if found, otherwise null.