查找字符串中的字符串

Question

如何编写if语句，以便在var MyString不在var URL中时发出警报？

var URL = "http://test.mysite.com/about/"; 
    var MyString = "mysite.com"; 

Answer 1

if (URL.indexOf(MyString) === -1) { 
    alert('Not found!'); 
} 

Answer 2

if(URL.indexOf(MyString) == -1) alert("Not found");