js 数组链接concat,和数组转字符串join,字符串转数

js 数组链接用concat

 <script type="text/javascript">
 var arr1=[1,2,3];
 var arr2=[6,7,8];

 alert(arr1.concat(arr2));
 </script>

js 数组转成字符串

<script type="text/javascript">
var arr=[1,2,3,4];

alert(arr.join('-'));
</script>

js 字符串转数组

<script type="text/javascript">
  var str='12-4-5-8';
   var arr=str.split('-');

  //'12-4-5'.split('-') ['12','4','5']

 alert(arr[0]+arr[1]);

 </script>