1、几天接到了一个奇葩的需求，就是在鼠标滚轮滑动的时候，div要悬浮不动，因此这引起了我对于javascript知识的复习
首先从最基础的变量的类型开始
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script type="text/javascript">
alert(undefined == null);
</script>
</head>
<body>
以上alert会显示true
2、全选，全不选和反选感觉个人真的不是对代码有依赖，感觉如果能不敲代码就真的棒级了，因此将来想回家帮妈妈买货，感觉能
靠嘴挣钱总比，动手强
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<br />
<input type="checkbox" name="items" value="足球">足球
<input type="checkbox" name="items" value="篮球">篮球
<input type="checkbox" name="items" value="排球">排球
<input type="checkbox" name="items" value="谭倩">谭倩
<br />
<input type="button" id="checkAll" value="全选">
<input type="button" id="nocheckAll" value="全不选">
<input type="button" id="oppositeAll" value="反选">
<script type="text/javascript">
var checkButton = document.getElementById("checkAll");
checkButton.onclick = function() {
var items = document.getElementsByName("items");
for (var i = 0; i < items.length; i++) {
if (!items[i].checked) {
items[i].checked = true;
}
}
}
var nocheckButton = document.getElementById("nocheckAll");
nocheckButton.onclick = function() {
var items2 = document.getElementsByName("items");
for (var i = 0; i < items2.length; i++) {
if (items2[i].checked) {
items2[i].checked = false;
}
}
}
var oppcheckButton = document.getElementById("oppositeAll");
oppcheckButton.onclick = function() {
var items3 = document.getElementsByName("items");
for (var i = 0; i < items3.length; i++) {
if (items3[i].checked) {
items3[i].checked = false;
} else {
items3[i].checked = true;
}
}
}
</script>
</body>
</html>
3、点击关上，点击打开
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style type="text/css">
div {
display: none;
}
a {
background-color: orange;
}
.open {
display: block;
}
.close {
display: none;
}
p{
font: bolder;
font-family: cursive;
font-style: italic;
color: blue;
background-color: orange;
}
table, tr, td {
padding: 0px;
}
</style>
<script type="text/javascript">
function openDiv(a) {
var currentDiv = a.parentNode.getElementsByTagName("div")[0];
var divs = document.getElementsByTagName("div");
for (var i = 0; i < divs.length; i++) {
if (currentDiv == divs[i]) {
currentDiv.className = "open";
} else {
divs[i].className = "close";
}
}
}
</script>
</head>
<body>
<table>
<tr>
<td><a onclick="openDiv(this)">高中同学</a>
<div>
<p>大勇</p> <p>君宇</p> <p>茂川</p>
</div></td>
</tr>
<tr>
<td><a onclick="openDiv(this)" >初中同学</a>
<div>
<p>浩晨</p> <p>孟凯妮</p> <p>李倩</p>
</div></td>
</tr>
<tr>
<td><a onclick="openDiv(this)">小学同学</a>
<div>
<p>想不起来了</p>
</div></td>
</tr>
<tr>
<td><a onclick="openDiv(this)">大学同学</a>
<div>
<p>王金鉴</p> <p>李俊峰</p> <p>王宝林</p>
</div></td>
</tr>
</table>
</body>
</html>
代码运行的结果如下所示
时间： 2024-10-11 10:14:01