武汉大学教务系统成绩页面各学分与GPA计算器
// ==UserScript==
// @name 教务系统学分与GPA
// @namespace http://tampermonkey.net/
// @version 0.3
// @description 武汉大学教务系统成绩页面各学分与GPA计算器
// @author Arichy
// @match http://210.42.121.132/stu/stu_index.jsp
// @match http://210.42.121.133/stu/stu_index.jsp
// @match http://210.42.121.134/stu/stu_index.jsp
// @match http://210.42.121.241/stu/stu_index.jsp
// @grant none
// ==/UserScript==
(function() {
'use strict';
function calculate(courseArr){
var gpSum = 0;//所有课程的绩点*学分的和
var creditSum = 0;//所有课程学分的和
var score;//每个课程的分数
var credit;//每个课程的学分
var gp;//每个课程的学分绩
var course;//每个课程
var credit0 = 0;//公选
var credit1 = 0;//公必
var credit2 = 0;//专选
var credit3 = 0;//专必
var gpa = 0;
for(var i=0;i<courseArr.length;i++){
course = courseArr[i];
score = parseFloat(course.score);
credit = parseFloat(course.credit);
if(score>=90){
gp = 4.0;
}
else if(score>=85){
gp = 3.7;
}
else if(score>=82){
gp = 3.3;
}
else if(score>=78){
gp = 3.0;
}
else if(score>=75){
gp = 2.7;
}
else if(score>=72){
gp = 2.3;
}
else if(score>=68){
gp = 2.0;
}
else if(score>=64){
gp = 1.5;
}
else if(score>=60){
gp = 1.0;
}
else{
gp = 0.0;
}
switch(course.type){
case 0: credit0 += credit; break;
case 1: credit1 += credit; break;
case 2: credit2 += credit; break;
case 3: credit3 += credit; break;
}
creditSum += credit;
gpSum += (credit*gp);
}
gpSum = parseFloat(gpSum.toFixed(4));
gpa = gpSum/creditSum;
return {
'公共选修':credit0,
'公共必修':credit1,
'专业选修':credit2,
'专业必修':credit3,
'总学分':creditSum,
'GPA':gpa.toFixed(3)
};
}
var typeMap = {
'公共选修':0,
'公共必修':1,
'专业选修':2,
'专业必修':3
};
var btn = document.getElementById('btn3');
var frame1,frame2,frame3;
var j=0;
btn.addEventListener('click',function(){
frame1 = document.getElementById('page_iframe').contentWindow;
frame3 = document.getElementById('bar_iframe').contentWindow;
var timer = setInterval(function (){
if(frame1.document.getElementById('iframe0')){//frame1已经加载完毕，此时可以获取成绩表格的frame2
frame2 = frame1.document.getElementById('iframe0').contentWindow;
if(frame2.document.getElementsByClassName('listTable')[0] && frame3.document.getElementById('listContent')){
var listContent = frame3.document.getElementById('listContent');
var resultTable = listContent.getElementsByClassName('listTable')[0];//右边结果的表格
var title = listContent.getElementsByClassName('listTitle')[0].innerHTML;
if(title=='学分和GPA统计'){
j++;
if(j>=8){//如果已经在成绩页面，此时点击成绩按钮，会由于js执行快于dom加载，js改变了dom之后，dom却刷新了。所以用j来多获取几次dom，目的是获取刷新之后的dom
j=0;
clearInterval(timer);
var gradeTable = frame2.document.getElementsByClassName('listTable')[0];//成绩的表格
var trs;
var tds;
var i;
trs = gradeTable.getElementsByTagName('tr');//成绩表格的每一行
var courseArr = [];
for(i=0;i<trs.length;i++){
tds = trs[i].getElementsByTagName('td');
if(tds[9] && tds[9].innerHTML){
var course = {};
course.name = tds[1].innerHTML;
course.credit = tds[3].innerHTML;
course.score = tds[9].innerHTML;
course.type = typeMap[tds[2].innerHTML];
courseArr.push(course);
}
}
var result = calculate(courseArr);
trs = resultTable.getElementsByTagName('tr');
console.log(trs);
for(i=1;i<trs.length;i++){
tds = trs[i].getElementsByTagName('td');
var key = tds[0].innerHTML;
if(result[key]!=null){
tds[1].innerHTML = result[key];
}
}
}
}
//按钮部分，由于没什么用所以暂时不做了
/*var wraptr = document.createElement('tr');
var wraptd = document.createElement('td');
var calBtn = document.createElement('button');
wraptd.setAttribute('colspan',2);
calBtn.innerHTML = '计算学分和GPA';
calBtn.onclick = function(e){
e.preventDefault();
e.returnValue = false;
};
var css = "padding:4px;margin:3px;border:1px solid black;border-radius:5px;cursor:pointer";
calBtn.setAttribute('style',css);
wraptr.appendChild(wraptd);
wraptd.appendChild(calBtn);
document.getElementById('bar_iframe').contentWindow.document.getElementById('listContent').getElementsByTagName('tbody')[0].appendChild(wraptr);*/
}
}
},20);
});
})();