SOURCE

 
 let random = arr => {
        arr = [...arr]
        let len = arr.length
        for (let i = 0; i < arr.length; i++) {
          let random = Math.floor(Math.random() * (len - i)) + i
          ;[arr[i], arr[random]] = [arr[random], arr[i]]
        }
        return arr
      }
        let a = [1, 2, 3, 4, 5, 6, 7, 8, 9]

      let ress = random(a)
      console.log(ress,a)


      var arr=[1,3,5,6,7,9,8];
    //   迭代
function foo(arr){
    var cloneArr=arr.concat();//拷贝数组
    var result=[];
    var len=cloneArr.length;
    for(var i=0;i<len;i++){
        var index=Math.floor(Math.random()*cloneArr.length);
        result=result.concat(cloneArr[index]);
    }
    return result;
}
for(var i=0;i<10;i++){
    console.log(foo(arr))
}