如何实现数组的随机排序？

方法一：

var arr = [1,2,3,4,5,6,7,8,9,10];
  	function randSort1(arr){
  		for(var i = 0,len = arr.length;i < len; i++ ){
  			var rand = parseInt(Math.random()*len);
  			var temp = arr[rand];
  			arr[rand] = arr[i];
  			arr[i] = temp;
  		}
  		return arr;
  	}
  	console.log(randSort1(arr));

 

方法二：

 var arr = [1,2,3,4,5,6,7,8,9,10];
 function randSort2(arr){
 var mixedArray = [];
 while(arr.length > 0){
 var randomIndex = parseInt(Math.random()*arr.length); 
mixedArray.push(arr[randomIndex]);
 arr.splice(randomIndex, 1);
 } return mixedArray; 
} 
console.log(randSort2(arr));

 

 方法三：

 var arr = [1,2,3,4,5,6,7,8,9,10];
 arr.sort(function(){
 return Math.random() - 0.5;
 })
 console.log(arr);