JS里对字符串的操作

var content = "12345,abcde";

var num = content.substring(0,5);//12345

var letter = content.substring(7,11);//abcde

var i = content.indexof(","); //6

var data = content.substring(i+1,content.length);//abcde

 content = content.replace("123","aaa");　　//content = "aaa45,abcde"; （未做全局替换）