var str = "123456", result = "";
for(var i=0,len=str.length;iresult += str[i];
if(i % 2 == 1) result += ',';
}
alert(result);
普通的 javascript 就可以做到,:)
var string = 'abcdefg';
var abc = substring(0,2);
var abcd = substring(2,4);
var abcde = substring(4,6);
var bigString = abc+','+abcd+','+abcde;