我正在用javascript为我教的历史课程构建数据随机化器。我希望用户输入表格形式的学生人数,周数和每位学生的分配网数量,然后通过单击按钮提交此数据。例如40名学生,12周,每名学生5个作业。因此,我希望程序生成一个40行的表,每个表包含5个从1到12的随机唯一数。我设法使该程序生成一行随机数(函数weekAssigned),但是后来我陷入了困境。如何重复使用weekAssigned函数来产生其他行?我试图使用二维数组,但是我不知道如何随机化2d数组中的每一行。我将非常感谢您的建议!我想我应该以某种方式利用for循环或2d数组,但是我不确定如何使用。
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;
}
答案 0 :(得分:0)
您需要做的就是循环C[1]
并将值推入2d数组中。
为帮助您解决此问题,请检查以下代码:
weeksAssigned
希望这会有所帮助:)
答案 1 :(得分:0)
在这里,您可以通过遍历每个学生然后遍历每个作业来完成此任务。
我首先创建一个二维数组,其中填充了0
,其行数与学生数相同,而列数与作业数一样
const assignArr = Array.from({ length: assignments }, (_, i) => 0);
const studentsArr = Array.from({ length: students }, (_, i) => [...assignArr]);
然后,您使用两个循环用随机的星期填充此数组。对于每个学生,您都要在循环开始时初始化可用的星期,然后将此数组传递给getRandomWeeks()
,这会从数组中删除随机的一周,因此您不必为每个学生重复它们:
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,您只需调用一个辅助函数来生成表。这是一个完整的演示。您可以编辑表单字段并查看表更新:
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>