如何获得数组中这些数字的总和？

Question

I want to use for . There are two things, one, the console.log doesn't work inside the for statement. Second, it is not summing up. code below:

var numbers = [1,2,3,4];
var total = 0;
for (var i= 0; numbers.length < i; i++){
    total += numbers[i];
   // console.log(total); doesn't work

}
// console.log(total); gives 0

Answer 1

Change condition in for should be i < numbers.length not numbers.length < i

 var numbers = [1,2,3,4]; var total = 0; for (var i= 0; i < numbers.length; i++){ total += numbers[i]; } console.log(total);

Answer 2

Your for loop is exiting immediately because of the condition

for (var i = 0; numbers.length < i; i++) {

Because numbers.length (in this case) is 4, and i is 0, the for loop never executes.

You probably want it flipped around, to say something like

for (var i = 0; i < numbers.length; i++) {