js数组与字符串的相互转换方法

1、数组转字符串
需要将数组元素用某个字符连接成字符串，示例代码如下：

var a, b ,c;
a = new Array(0,1,2,3,4);
b = a.join("");      //"01234"
b = a.join(",");      //"0,1,2,3,4"

2、字符串转数组

实现方法为将字符串按某个字符切割成若干个字符串，并以数组形式返回，示例代码如下：

var s = "abc,abcd,aaa";
ss = s.split(",");// 在每个逗号(,)处进行分解  ["abc", "abcd", "aaa"]
var s1 = "helloworld";
ss1 = s1.split('');  //["h", "e", "l", "l", "o", "w", "o", "r", "l", "d"]