<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
div{
width: 1000px;
height: 200px;
background-color: lavender;
box-shadow: 5px 5px 2px lightblue;
}
button{
margin-left: 20px;
}
.ys{
border: 1px solid yellow;
height: 50px;
width: 50px;
margin-left: 5px;
float: left;
}
.ys1{
border: 1px solid yellow;
height: 50px;
width: 50px;
margin-left: 5px;
float: left;
}
</style>
</head>
<body>
<input type="checkbox" id="qx" value="" onclick="qx()"/>全选
<input type="checkbox" id="fx" value="" onclick="fx()" />反选
<input type="checkbox" name="xz" id="" value="语文" />语文
<input type="checkbox" name="xz" id="" value="数学" />数学
<input type="checkbox" name="xz" id="" value="英语" />英语
<input type="checkbox" name="xz" id="" value="物理" />物理
<input type="checkbox" name="xz" id="" value="化学" />化学
<input type="checkbox" id="bx" value="" onclick="bx()"/>不选
<br />
<div id="">
while循环
<br />
<br />
<button onclick="five()">循环出现提示框5次</button>
</div>
<br />
<br />
<br />
<div id="">
for循环
<br />
<br />
<button onclick="ys11()">批量修改样式</button>
<br />
<br />
<br />
<div class="ys"></div>
<div class="ys"></div>
<div class="ys"></div>
<div class="ys"></div>
</div>
<br />
<br />
<br />
<div id="">
for循环
<br />
<br />
<button onclick="ys12()">批量修改样式可循环</button>
<br />
<br />
<br />
<div class="ys1"></div>
<div class="ys1"></div>
<div class="ys1"></div>
<div class="ys1"></div>
</div>
</body>
</html>
<script type="text/javascript">
function fx(){
var fx = document.getElementById("fx");
var attr = document.getElementsByName("xz");
for(var i = 0; i<attr.length;i++){
if(fx.checked){
if(attr[i].checked){
attr[i].checked = false;
}
else{
attr[i].checked = true;
}
}
else{
if(attr[i].checked){
attr[i].checked = false;
}
else{
attr[i].checked = true;
}
}
}
}
function qx(){
var qx = document.getElementById("qx");
var attr = document.getElementsByName("xz");
for(var i = 0;i<attr.length;i++){
if(qx.checked){
attr[i].checked = true;
}
else{
attr[i].checked = false;
}
}
}
function bx(){
var bx = document.getElementById("bx");
var attr = document.getElementsByName("xz");
if(bx.checked){
for(var i = 0;i<attr.length;i++){
attr[i].checked=false;
}
}
}
function five(){
for(var i = 1;i<=5;i++){
alert("这是第"+i+"次弹出");
}
}
function ys11(){
var attr = document.getElementsByClassName("ys");
for(i = 0;i<attr.length;i++){
attr[i].style.backgroundColor = "yellow";
}
}
function ys12(){
var attr = document.getElementsByClassName("ys1");
for(i = 0;i<attr.length;i++){
if(attr[i].style.backgroundColor=="yellow"){
attr[i].style.backgroundColor = "lavender";
}
else{
attr[i].style.backgroundColor="yellow";
}
}
}
</script>
