练习 1: 求数组中所有元素的和
- var arr1 = [10, 20, 30, 40, 50];
- var sum = 0;
- for (var i = 0; i < arr1.length; i++) {
- sum += arr1[i];
- }
- console.log(sum);
练习 2: 求数组中所有元素的平均值
- var arr2 = [1, 2, 3, 4, 5];
- var sum2 = 0;
- for (var i = 0; i < arr2.length; i++) {
- sum2 += arr2[i];
- }
- console.log(sum2 / arr2.length);
练习 3: 求数组中所有元素中的最大值
- var arr3 = [1, 9, 3, 10, 3330, 32];
- var max = arr3[0];
- for (var i = 0; i < arr3.length; i++) {
- if (max < arr3[i]) {
- max = arr3[i];
- }
- }
- console.log("最大值:" + max);
来源: http://www.bubuko.com/infodetail-3302800.html