adding numbers in for loop javascript

var nums = ['100','300','400','60','40'];
var sum = 0;

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

    sum += parseInt(nums[i]);

}

alert(sum);

Tested: http://jsfiddle.net/GYpd2/6/ (thanks to user1503606)

If nums contains numbers only there is no need for parseInt().

Prime example for ES5's Array.prototype.reduce method. Like:

var nums  = ['100','300','400','60','40'];

var total = nums.reduce(function(a,b) {
    return (+a)+(+b);
});

Demo: http://jsfiddle.net/FwfmE/

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