在字符串中查找字符串

Question

如何编写一个if语句，当var MyString不在var URL中时会发出警告？

  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");