cell3.innerHTML = <select id="menu1" onchange="replaceMenu(this)"> <option value="1">选项1</option> <option value="2">选项2</option> <option value="3">选项3</option> </select>; 正确吗?
时间: 2023-06-16 13:07:01 浏览: 71
不正确。在 JavaScript 中,字符串需要用引号包裹起来。因此,可以这样写:
```
cell3.innerHTML = '<select id="menu1" onchange="replaceMenu(this)"><option value="1">选项1</option><option value="2">选项2</option><option value="3">选项3</option></select>';
```
这样就可以将字符串作为 HTML 代码插入到元素中了。注意,这段代码中的双引号需要转义。
相关问题
<!DOCTYPE html> <html> <head> <title>表格形式</title> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <style> table, th, td { border: 1px solid black; border-collapse: collapse; padding: 5px; } </style> <script> // 添加一行 function addRow(tableID) { var table = document.getElementById(tableID); var rowCount = table.rows.length; var row = table.insertRow(rowCount); for(var i = 0; i < 5; i++){ var cell = row.insertCell(i); cell.innerHTML = '<select><option value="1">选项1</option><option value="2">选项2</option><option value="3">选项3</option></select>'; cell.onclick = function(){ this.firstChild.style.display = 'block'; } cell.firstChild.onblur = function(){ this.style.display = 'none'; } cell.firstChild.style.display = 'none'; } } </script> </head> <body> <table id="myTable"> <thead> <tr> <th>列1</th> <th>列2</th> <th>列3</th> <th>列4</th> <th>列5</th> </tr> </thead> <tbody> <tr> <td><select><option value="1">选项1</option><option value="2">选项2</option><option value="3">选项3</option></select></td> <td><select><option value="1">选项1</option><option value="2">选项2</option><option value="3">选项3</option></select></td> <td><select><option value="1">选项1</option><option value="2">选项2</option><option value="3">选项3</option></select></td> <td><select><option value="1">选项1</option><option value="2">选项2</option><option value="3">选项3</option></select></td> <td><select><option value="1">选项1</option><option value="2">选项2</option><option value="3">选项3</option></select></td> </tr> </tbody> </table> <button onclick="addRow('myTable')">增加</button> </body> </html>将这段代码用bootstrap进行优化
Sure! 这个表格的代码可以用 Bootstrap 进行优化,具体的代码如下:
<!DOCTYPE html>
<html>
<head>
<title>表格形式</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- 引入 Bootstrap 的 CSS 文件 -->
<link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.5.0/css/bootstrap.min.css">
<style>
table { border: 1px solid black; border-collapse: collapse; padding: 5px; }
</style>
</head>
<body>
<div class="container">
<table class="table table-bordered table-hover">
<thead>
<tr>
<th>列1</th>
<th>列2</th>
<th>列3</th>
<th>列4</th>
<th>列5</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<select class="form-control">
<option value="1">选项1</option>
<option value="2">选项2</option>
<option value="3">选项3</option>
</select>
</td>
<td>
<select class="form-control">
<option value="1">选项1</option>
<option value="2">选项2</option>
<option value="3">选项3</option>
</select>
</td>
<td>
<select class="form-control">
<option value="1">选项1</option>
<option value="2">选项2</option>
<option value="3">选项3</option>
</select>
</td>
<td>
<select class="form-control">
<option value="1">选项1</option>
<option value="2">选项2</option>
<option value="3">选项3</option>
</select>
</td>
<td>
<select class="form-control">
<option value="1">选项1</option>
<option value="2">选项2</option>
<option value="3">选项3</option>
</select>
</td>
</tr>
</tbody>
</table>
<div class="text-center">
<button class="btn btn-primary" onClick="addRow('myTable')">增加</button>
</div>
</div>
<!-- 引入 Bootstrap 的 JS 文件 -->
<script src="https://cdn.staticfile.org/jquery/3.5.1/jquery.min.js"></script>
<script src="https://cdn.staticfile.org/popper.js/1.16.0/umd/popper.min.js"></script>
<script src="https://cdn.staticfile.org/twitter-bootstrap/4.5.0/js/bootstrap.min.js"></script>
<script>
// 添加一行
function addRow(tableID) {
var table = document.getElementById(tableID);
var rowCount = table.rows.length;
var row = table.insertRow(rowCount);
for(var i = 0; i < 5; i++) {
var cell = row.insertCell(i);
cell.innerHTML = '<select class="form-control"><option value="1">选项1</option><option value="2">选项2</option><option value="3">选项3</option></select>';
cell.onclick = function(){ this.firstChild.style.display = 'block'; }
cell.firstChild.onblur = function(){ this.style.display = 'none'; }
cell.firstChild.style.display = 'none'; }
}
</script>
</body>
</html>
我希望这个帮助到你!
<!DOCTYPE html> <html lang="en"> <head> <title>下拉列表</title> <meta charset="utf-8"> <script> // 加载年份下拉列表 onload = function() { var yearSelect = document.getElementById("yearSelect"); for (var year = 1949; year <= 2049; year++) { var option = document.createElement("option"); option.value = year; option.innerText = year + "年"; yearSelect.appendChild(option); } // 更新日期下拉列表最大值 function updateDay() { var year = parseInt(yearSelect.value); var month = parseInt(monthSelect.value); var daySelect = document.getElementById("daySelect"); daySelect.innerHTML = ""; // 处理2月份情况 var maxDay = 31; if (month == 2) { if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)) { maxDay = 29; } else { maxDay = 28; } } else if (month == 4 || month == 6 || month == 9 || month == 11) { maxDay = 30; } for (var day = 1; day <= maxDay; day++) { var option = document.createElement("option"); option.value = day; option.innerText = day + "日"; daySelect.appendChild(option); } } // 初始化日期下拉列表 updateDay(); }; </script> </head> <body> <label>年份: </label> <select id="yearSelect" onchange="updateDay()"> </select> <label>月份: </label> <select id="monthSelect" onchange="updateDay()"> <option value="1">1月</option> <option value="2">2月</option> <option value="3">3月</option> <option value="4">4月</option> <option value="5">5月</option> <option value="6">6月</option> <option value="7">7月</option> <option value="8">8月</option> <option value="9">9月</option> <option value="10">10月</option> <option value="11">11月</option> <option value="12">12月</option> </select> <label>日期: </label> <select id="daySelect"> </select> </body> </html>
这是一个使用 HTML 和 JavaScript 实现的下拉列表,可以选择年份、月份和日期,其中日期根据所选年份和月份动态更新。代码中使用了 onload 事件来加载年份下拉列表,并在选择年份或月份时触发 updateDay() 函数来更新日期下拉列表的最大值。在 updateDay() 函数中,根据所选年份和月份计算出最大天数,并使用循环语句来添加相应数量的选项到日期下拉列表中。
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