计算平均绩点
// ==UserScript==
// @name BIT-本科生教务-学生个人考试成绩
// @namespace http://tampermonkey.net/
// @version 0.0.2
// @description 计算平均绩点
// @license GPL-3.0-or-later
// @supportURL https://github.com/YDX-2147483647/BIT-enhanced/issues
// @author Y.D.X.
// @match http://jwms.bit.edu.cn/jsxsd/kscj/cjcx_list
// @match https://jwms.bit.edu.cn/jsxsd/kscj/cjcx_list
// @match https://webvpn.bit.edu.cn/http/77726476706e69737468656265737421fae04c8f69326144300d8db9d6562d/jsxsd/kscj/cjcx_list
// @grant none
// @run-at document-end
// ==/UserScript==
(function () {
'use strict'
/* spell-checker: disable */
const selectors = {
grade: '#dataList > * > tr > td:nth-child(5)',
weight: '#dataList > * > tr > td:nth-child(7)',
statistics: 'body > div:nth-child(12) > strong'
}
/* spell-checker: enable */
function get_data () {
const [grade_elements, weight_elements] = [selectors.grade, selectors.weight]
.map(s => Array.from(document.querySelectorAll(s)))
const [grades, weights] = [grade_elements, weight_elements].map(elements =>
elements.map(e => Number(e.textContent))
)
return { grades, weights }
}
/**
* @param {{grades: number[], weights: number[]}} param0
*/
function calc_GPA ({ grades, weights }) {
const products = grades.map((grade, index) => grade * weights[index])
const sum = products.reduce((sum, p) => sum + p, 0)
const total_weight = weights.reduce((sum, w) => sum + w)
return sum / total_weight
}
/**
* @param {Number} GPA_value
*/
function show_GPA (GPA_value) {
const output_element = document.querySelector(selectors.statistics)
const { got, to_get } = output_element.textContent
.match(/^已获得学分：(?<got>[\d.]+)\s+未获得学分：(?<to_get>[\d.]+)$/)
.groups
output_element.textContent = [
`已获得 ${got} 学分，待获得 ${to_get} 学分。`,
`当前页平均绩点为 ${GPA_value.toFixed(2)}。`
].join('')
}
show_GPA(calc_GPA(get_data()))
})()