GPA calculator for SYSU third party academic administration system

gpa.js

var tr = $("#score-result table tbody tr");
var credit_total = 0.0, total = 0.0;
tr.each(function(idx, row) {
	var credit = parseFloat($(row).children('td')[0].textContent);
	var score = parseFloat($(row).children('td')[2].textContent);

	credit_total += credit;
	total += score * credit;
});

console.log(total/credit_total);