js从数组中随机多次获取三个值，三个值不相同，上下相邻获取值也不相同

js从数组中随机多次获取三个值，三个值不相同，上下相邻获取值也不相同 一、简单的数组排列

let numArr = [1, 2, 3, 4]
numArr.sort(function() {
    return 0.5 - Math.random();
})

二、从数组中随机多次获取三个值，上下相邻获取值不相同

let oldCakeList = [];
let arr = [];
for (var i=0; i< taskList.length; i ++) {  // 循环获取随机值数组arr
    this.handleGetRandom (oldList, (newList) => {
                 console.log('获取到的随机数======', newList);
                 oldList= newList;
                 arr.push(newList);
    });
}

handleGetRandom = (oldList, callback) => {
       let {dataList} = Data;// 获取原基数
       let upList = oldList;
       let Finish = JSON.parse(JSON.stringify(dataList));
       if (upCakeList.length > 0) { // 删除上一次随机的值，获取新的随机基数
           Finish.splice(Finish.indexOf(upList [0]), 1);
           Finish.splice(Finish.indexOf(upList [1]), 1);
           Finish.splice(Finish.indexOf(upList [2]), 1);
       }
       var newList= [];
       for (var i = 0; i < 3; i ++) { // 获取不重复随机值
           let num = Math.floor(Math.random()*Finish.length);
           let random= Finish[num];
           Finish.splice(num, 1);
           newList.push(random);
       }
        return callback(newList);
}