我建立在JavaScript数据随机化的历史课,我教。我希望用户进入的学生,周数,以及每个学生assignmnets数量的发票号,并通过点击一个按钮提交该数据。例如40名学生,12周,5个分配为每一位学生。因此,我希望程序生成的40行,每行含有5个随机唯一号码从1到12我设法使程序生成随机数的一列(功能weeksAssigned)的表,但随后就挂住。我怎样重复功能weeksAssigned生产其他行?我试图用二维数组,但我不知道如何随机二维数组中的每一行。我将是您的建议,非常感谢!我想我应该以某种方式利用或者一个for循环或二维数组,但我不知道怎么样。
function getRandomWeek() {
var x,y;
x = document.getElementById("form1").elements["duration"].value;
y = Math.floor(Math.random() * x + 1);
return y;
}
function weeksAssigned() {
var ints = [];
var assignments = document.getElementById("form1").elements["assignments"].value;
while (ints.length < assignments) {
var randomWeak = getRandomWeek();
if (ints.indexOf(randomWeak)===-1) {
ints.push(randomWeak);
}
}
ints.sort(function(a, b){return a-b});
return ints;
}
这里是你如何通过遍历每个学生,然后在每个分配新建分配FY做到这一点。
我首先创建填有因为有学生和尽可能多的列有分配尽可能多的行0
一个二维数组:
const assignArr = Array.from({ length: assignments }, (_, i) => 0);
const studentsArr = Array.from({ length: students }, (_, i) => [...assignArr]);
然后,使用两个循环来填补这个数组随机星期。对于每一个学生,你在循环的开始初始化可用周,你通过这个数组getRandomWeeks()
从阵列中删除随机星期,所以你不要重复他们为每个学生:
for (let student = 0; student < students; ++student) {
const weeks = Array.from({ length: duration }, (_, i) => i);
for (let work = 0; work < assignments; ++work) {
studentsArr[student][work] = getRandomWeek(weeks) + 1;
}
studentsArr[student].sort((a, b) => a - b);
}
function getRandomWeek(weeks) {
const weekIdx = Math.floor(Math.random() * weeks.length);
return weeks.splice(weekIdx, 1).shift();
}
然后,你只需要调用一个辅助函数生成表。下面是一个完整的演示。您可以编辑表单域,看看表更新:
function update() {
const form = document.getElementById('form');
const duration = form.elements['weeks'].value;
const students = form.elements['students'].value;
const assignments = form.elements['assignments'].value;
const assignArr = Array.from({ length: assignments }, (_, i) => 0);
const studentsArr = Array.from({ length: students }, (_, i) => [...assignArr]);
for (let student = 0; student < students; ++student) {
const weeks = Array.from({ length: duration }, (_, i) => i);
for (let work = 0; work < assignments; ++work) {
studentsArr[student][work] = getRandomWeek(weeks) + 1;
}
studentsArr[student].sort((a, b) => a - b);
}
makeTable(studentsArr);
}
function getRandomWeek(weeks) {
const weekIdx = Math.floor(Math.random() * weeks.length);
return weeks.splice(weekIdx, 1).shift();
}
function makeTable(data) {
const header = document.querySelector('#table thead tr');
header.innerHTML = '';
for (let i = 0; i < data[0].length + 1; ++i) {
const colEl = document.createElement('th');
colEl.textContent = i === 0 ? 'Assignments' : `#${i}`;
header.appendChild(colEl);
}
const tbody = document.querySelector('#table tbody');
tbody.innerHTML = '';
data.forEach((row, i) => {
const rowEl = document.createElement('tr');
const col0 = document.createElement('td');
col0.textContent = `Student #${i + 1}`;
rowEl.appendChild(col0);
for (let col of row) {
const colEl = document.createElement('td');
colEl.textContent = col;
rowEl.appendChild(colEl);
}
tbody.appendChild(rowEl);
});
}
update();
table {
margin: 10px;
border-collapse: collapse;
text-align: center;
}
td, th {
border: 1px solid black;
padding: 3px;
}
<form id="form">
Weeks <input type="number" name="weeks" value=12 onchange="update()">
Students <input type="number" name="students" value=10 onchange="update()">
Assignments <input type="number" name="assignments" value=5 onchange="update()">
</form>
<table id="table">
<thead>
<tr>
</tr>
</thead>
<tbody>
</tbody>
</table>
所有你需要做的是循环weeksAssigned
和二维数组推值。
为了帮你,请检查下面的代码:
var students = document.getElementById("form1").elements["students"].value;
var studentsAssignList = [];
for(var i = 0; i < students; i++){
var assignList = weeksAssigned();
studentsAssignList.push(assignList);
}
// `studentsAssignList` will be your 2d array of all the assignments for all the students
希望这可以帮助 :)