字符串转数组的几种方法和字符串的截取

var str="[2,34,3.4]"; 
var strNew=eval(str); 
console.log(strNew[0]+"--"+strNew[1]+"--"+strNew[2]);
//2--34--3.4

var str2="2,34,3.4";
var str2New=str2.split(",");
console.log(str2New[0]+"++"+str2New[1]+"++"+str2New[2]);
//2++34++3.4

var str="合适dsw(18701200120)";
var strNew =str.replace("(","").replace(")","");
var strNewIphone=strNew.substr(strNew.length-11);
var strNewName=strNew.substring(0,strNew.length-11);
console.log(strNewName+"---"+strNewIphone);
//合适dsw---18701200120