js模拟php的shuffle函数，用来打乱一维数组

 

 

Array.prototype.shuffle = function() {
 var len = this.length;
 var i = len;
 while (i--) {
  var p = parseInt(Math.random() * len);
  var t = this[i];
  this[i] = this[p];
  this[p] = t;
 }
 return this;
};