<script>
        //for循环实现
        var sum=0;
        for (var i=0;i<101;i++){
            sum+=i
        }
        console.log(sum);
 
        //while实现
        var its=0;
        var all=0;
        while (its<101){
            all +=item;
            item++;
        }
        console.log(all);

 </script>