几道js数组循环练习题

 //随机弹出一个人的姓名
var nameArr = ["张超","刘圣骞","梁栋","冯旭","赵玉仙","李训峰","刘健"];

            <script>
            var nameArr = ["张超","刘圣骞","梁栋","冯旭","赵玉仙","李训峰","刘健"];
            var num=parseInt(Math.random()*7);
            console.log(nameArr[num]);
            </script>

//彩票36选7  不重

            <script>
            var nums=[];
            var newNums=[];
            for(var i=0;i<36;i++){
                nums.push(i);
            }
            for(var j=0;j<7;j++){
                var num=parseInt(Math.random()*36);
                if(newNums.indexOf(nums[num])==-1){
                    newNums.push(nums[num]);
                }else{
                    i--;
                }
            }
            console.log(newNums);
            </script>

//青歌赛打分、10位评委给一个选手打分、去掉一个最高分、去掉一个最低分求平均得分和去掉两个分

//3377加减乘除 = 24