如何实现数组的随机排序？

一，

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

二，

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

三，

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