javascript - 通过 for 循环添加数组值

Question

我想重写这一行:

var mySum = myArray[0] + myArray[1] + myArray[2] + myArray[3];

考虑到我不知道数组中有多少个元素，我是这样想的:

 for (var = count; count < array.length; count++)
    {
    var mySum = ?? // but what's the math for this
    }

Answer 1

看起来像这样:

var mySum = 0;
for( var i = 0, len = myArray.length; i < len; i++ ) mySum += myArray[ i ];