//--------------------数组转字符串---------------------------

     //需要将数组元素用某个字符连接成字符串

     var a1, b1,c1;

     a1 = ["a","b","c","d","e"];

     b1 = a1.join('-'); //a-b-c-d-e  使用-拼接数组元素

     c1 = a1.join(''); //abcde

     //--------------------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

     var str = 'ab-c-de';

     var a2 = str.split('-'); // [ab, c, de]

     var b2 = str.split(''); //[a, b, -, c, -, d, e]