参考“菜鸟教程”
http://www.runoob.com/js/js-strings.html
1.search() var s = "Hello World"; alert(s.search(/World/i)); //输出6
//相当于
alert(s.search("World"));
2.replace() var s = "Hello World"; alert(s.replace(/World/i,"China")); //相当于 alert(s.replace("World","China"));