JS基礎語法---數組案例---5個練習，陸續記錄中

練習1：求數組中全部元素的和

    var arr1 = [10, 20, 30, 40, 50];
    var sum = 0;
    for (var i = 0; i < arr1.length; i++) {
      sum += arr1[i];
    }
    console.log(sum);

 

練習2：求數組中全部元素的平均值

    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);

 

練習3：求數組中全部元素中的最大值

      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);