Summation of array extension methods

Implementation function: If it is a number, add it directly; if it is a string, stitch it up; if both, then stitch the string behind the number.

If this method already exists, assign the value directly
Array.prototype.sum = Array.prototype.sum | | Function (argument) {
    var sum;
    if (typeof argument = = ' number ') {
        sum = 0;

    } else {
        sum = ';
    }
Use arguments wisely (if you don't understand what arguments means, you can see its effect first)
    for (var  i =0;i<arguments.length;i++) {
        Sum + = Arguments[i];
    }
    return sum;
}

var arr1 = new Array ();
var arr2 = new Array ();
Remember to call the method here, write into the parameter
var sum1 = arr1.sum (1,2,5, ' A ', ' B ');
var sum2 = arr2.sum (' A ', ' B ', ' C ');

Summation of array extension methods