我想写一个JavaScript函数，生成以下HTML表:
| x | x^2 | 1/x |
|---------------|
| 1 | 1 | 1 |
|---|-----|-----|
| 4 | 16 | 0.25|
这是我到目前为止的代码。我必须使用FOR LOOP来构造和标记，以便将x、x^2和1/x的值放入表中。它是不完整的，因为我不确定从现在开始要做什么。任何帮助都会很感激!!
<!DOCTYPE html>
<html>
<head>
<style>
table {
border: 1px solid black;
width:50%;
border-collapse:collapse;
align:center;
}
th {
align:center;
font-weight:bold;
border: 1px solid black;
}
</style>
<script>
function square(n)
{
var sqNum = n * n;
return sqNum;
}
function inverse(n)
{
var invNum = 1 / n;
return invNum;
}
function generateTable()
{
var tableMain = document.getElementById("table");
for (var i = 0; i <= 5; i++)
{
var x = i;
var xSquare = square(i);
var xInv = inverse(i)
</script>
</head>
<body>
<table id="table">
<tr bgcolor="gainsboro">
<th>x</th>
<th>X<sup>2</sup></th>
<th><sup>1</sup>/<sub>x</sub></th>
</tr>
</table>
</body>
<html>
使用insertAdjacentHTML和模板文字创建行
generateTable();
function generateTable(n = 5) {
const square = n => n * n;
const inverse = n => 1 / n;
const tableMain = document.querySelector("table");
for (let i = 1; i <= n; i++) {
tableMain.insertAdjacentHTML(
`beforeend`,
`<tr><td>${i}</td><td>${square(i)}</td><td>${inverse(i).toFixed(2)}</td></tr>`)
}
}table {
border: 1px solid black;
border-collapse: collapse;
text-align: center;
}
th, td {
text-align: center;
font-weight: bold;
border: 1px solid black;
padding: 1px 6px;
}
td {
font-weight: normal;
}<table id="table">
<tr bgcolor="gainsboro">
<th>x</th>
<th>X<sup>2</sup></th>
<th><sup>1</sup>/<sub>x</sub></th>
</tr>
</table>如果你想要的东西可能是这样的
function square(n){
var sqNum = n * n;
return sqNum;
}
function inverse(n){
var invNum = 1 / n;
return invNum;
}
function generateTable(){
var tableMain = document.getElementById("table");
for (var i = 0; i <= 5; i++){
var x = i;
var xSquare = square(i);
var xInv = inverse(i);
var tr = document.createElement('tr');
var td1 = document.createElement('td');
var td2 = document.createElement('td');
var td3 = document.createElement('td');
td1.innerHTML = x;
td2.innerHTML = xSquare;
td3.innerHTML = xInv;
tr.appendChild(td1);
tr.appendChild(td2);
tr.appendChild(td3);
tableMain.appendChild(tr);
}
}
generateTable();table {
border: 1px solid black;
border-collapse: collapse;
text-align: center;
}
th, td {
text-align: center;
font-weight: bold;
border: 1px solid black;
padding: 1px 6px;
}
td {
font-weight: normal;
}<table id="table">
<tr bgcolor="gainsboro">
<th>x</th>
<th>X<sup>2</sup></th>
<th><sup>1</sup>/<sub>x</sub></th>
</tr>
</table>可能是这样的
-HTML-
<div class="col-sm-6">
<h3>Example</h3>
<div class="form-group">
<input id="myInput" type="number" value="" />
<button id="myButton">Add</button>
</div>
<div>
<table id="myTable" class="table table-bordered">
<thead>
<tr>
<th>X</th>
<th>X^2</th>
<th>1/X</th>
</tr>
</thead>
<tbody>
</tbody>
</table>
</div>
</div>
-JS-
function generateRow(rowLimit){
let myTable = document.getElementById("myTable").getElementsByTagName('tbody')[0];
myTable.innerHTML = ""; // reset row
for (let i = 1; i <= rowLimit; i++){
// Insert a row
let newRow = myTable.insertRow();
// Insert a cell at the new row
// firstCell -> value = x
let cell0 = newRow.insertCell();
cell0.innerHTML = i;
// secondCell -> square = x * x
let cell1 = newRow.insertCell();
cell1.innerHTML = (i * i);
// lastCell -> inverse = 1 / x
let cell2 = newRow.insertCell();
cell2.innerHTML = (1 / i).toFixed(3);
}
}
document.getElementById('myButton').addEventListener("click", function(){
let myInput = document.getElementById("myInput");
let myValue = myInput.value;
generateRow(myValue);
});
Demo: https://jsfiddle.net/uhLwr8bz/4/
*注:此代码使用bootstrap.css