var str = "1,2,3,4,5"; var array = str.split(",");//逗号是分隔符返回 [1,2,3,4,5]
var a = [1,2,3,4,5]; //定义数组 var s = a.join(","); //指定分隔符 console.log(s); //返回字符串“1,2,3,4,5”