Calc TTU student's GPA.

ttuGPA.js

//  https://stucis.ttu.edu.tw/academic/ascoresbj.php
var regex = /^(\u62B5|\(?-?[0-9]{1,3}\)?)$/
var totalPoints = 0;
var totalCredit = 0;
var nums = [].slice.call(document.querySelectorAll('td'))
.filter(function(e){ return regex.test(e.textContent); })
.map(function(num, idx ,arr){
    var b = Number(num.innerHTML);
    if (idx % 2 === 1) {
        var a = Number(arr[idx-1].innerHTML);
        var p;
        if(b < 50) {
            p = 0;
        } else if(b < 60) {
            p = 1;
        } else if(b < 70) {
            p = 2;
        } else if(b < 80) {
            p = 3;
        } else {
            p = 4;
        }
        totalCredit += a;
        totalPoints += p * a;
    }
    return b;
})
alert("Your GPA is : " + (totalPoints / totalCredit));