JS 求一组数中所有数的和以及平均值
1 var arr = [10,20,30];
2 //计数器思想
3 var sum = 0;
4 for(var i=0;i<arr.length;i++){
5 sum += arr[i];
6 }
7 console.log(sum);
8 var avg = sum/arr.length;
9 console.log(avg);
1 var arr = [10,20,30];
2 //计数器思想
3 var sum = 0;
4 for(var i=0;i<arr.length;i++){
5 sum += arr[i];
6 }
7 console.log(sum);
8 var avg = sum/arr.length;
9 console.log(avg);