<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
*{
margin: 0px auto;
padding: 0px;
}
.box{
1000px;
height: 100px;
border: 1px solid red;
line-height: 100px;
text-align: center;
}
.box1{
500px;
height: 200px;
border: 1px solid red;
background-color: cadetblue;
line-height: 100px;
text-align: center;
}
.box2{
100px;
height: 50px;
border: 1px solid red;
border-radius: 5px;
background-color: burlywood;
float: left;
margin-top: 25px;
margin-left: 25px;
transition: 1s;
}
.box3{
50px;
height: 50px;
border: 1px solid red;
background-color: cadetblue;
float: left;
border-radius: 10px;
margin-top: 25px;
margin-left: 25px;
transition: 1s;
}
/*.box4{
50px;
height: 50px;
border: 1px solid red;
background-color: burlywood;
float: left;
border-radius: 25px;
margin-top: 25px;
margin-left: 25px;
}*/
</style>
</head>
<body>
<div class="box">
<button onclick="dianji('blue')">背景变蓝</button>
<button onclick="dianji('green')">背景变绿</button>
<button onclick="dianji('yellow')">背景变黄</button>
<button onclick="dianji('')">恢复原样</button>
</div>
<div class="box">
<button onclick="dianjia('width','500px')">背景变窄</button>
<button onclick="dianjia('background-color','green')">背景变绿</button>
<button onclick="dianjia('height','200px')">背景变宽</button>
<button onclick="dianjia()">恢复原样</button>
</div>
<div class="box">
<input type="" name="" id="" value="这是原来的文字" />
<button onclick="dianjib('value','这是改变后的文字')">改变文字</button>
<button onclick="dianjib('title','这是title')">添加title属性</button>
</div>
<div class="box">
<button onclick="dianjic('box1')">变色、变高、变窄</button>
<button onclick="dianjic('box')">恢复原样</button>
</div>
<div class="box">
<button onclick="dianjid()">循环出现提示框五次</button>
</div>
<div class="box">
<button onclick="dianjie('background-color','cadetblue')">批量修改样式</button>
<div class="box2" name ="1" ></div>
<div class="box2" name ="1" ></div>
<div class="box2" name ="1" ></div>
<div class="box2" name ="1" ></div>
<div class="box2" name ="1" ></div>
</div>
<div class="box">
<button onclick="dianjif('burlywood','100px')">批量修改样式</button>
<div class="box3" name ="1" ></div>
<div class="box3" name ="1" ></div>
<div class="box3" name ="1" ></div>
<div class="box3" name ="1" ></div>
<div class="box3" name ="1" ></div>
</div>
<div class="box">
<input type="checkbox" name="" id="" value="" class="check"/>
<input type="checkbox" name="" id="" value="" class="check"/>
<input type="checkbox" name="" id="" value="" class="check"/>
<input type="checkbox" name="" id="" value="" class="check"/>
<input type="checkbox" name="" id="" value="" class="check"/>
<input type="checkbox" name="" id="" value="" class="check"/>
<button onclick="dianjig('quanxuan')">全选</button>
<button onclick="dianjig('fanxuan')">反选</button>
<button onclick="dianjig('buxuan')">全都不选</button>
</div>
</body>
</html>
<script type="text/javascript">
function dianji(color){
var sj1 = document.getElementsByTagName("div")[0];
sj1.style.backgroundColor = color;
}
function dianjia(x,y){
var sj2 = document.getElementsByTagName("div")[1];
sj2.style[x] = y;
}
function dianjib(name,room){
var sj3 = document.getElementsByTagName("input")[0];
sj3.setAttribute(name,room);
}
function dianjic(name){
var sj4 = document.getElementsByTagName("div")[3];
sj4.setAttribute("class",name);
}
function dianjid(){
for (var i = 1;i <= 5;i++) {
alert("这是第"+ i +"次弹出");
}
}
function dianjie(x,y){
for(var i = 0;i < document.getElementsByClassName("box2").length + i;i++){
var box = document.getElementsByClassName("box2");
box[0].setAttribute("class","box3");
}
}
// 每次循环把box2的第0项改变为box3,下次循环时,上次循环中的box2第1项变为这次循环中box2的第0项,同时长度lenggth减1
function dianjif(x,y){
var moren = document.getElementsByName("1")[0].getAttribute("class");
if( moren == "box3"){
for(var i = 0;i < document.getElementsByClassName("box3").length + i;i++){
var boxa = document.getElementsByClassName("box3");
boxa[0].setAttribute("class","box2");
}
}else {
for(var i = 0;i < document.getElementsByClassName("box2").length + i;i++){
var box = document.getElementsByClassName("box2");
box[0].setAttribute("class","box3");
}
}
// var sj5 = document.getElementsByClassName("box3");
// if (sj5[0].getAttribute("name") == "1") {
// for (var i = 0;i < sj5.length;i++) {
// sj5[i].style.backgroundColor = x;
// sj5[i].style.width = y;
// sj5[i].setAttribute("name","2");
// }
// } else{
// for (var i = 0;i < sj5.length;i++) {
// sj5[i].style.backgroundColor = "cadetblue";
// sj5[i].style.width = "50px";
// sj5[i].setAttribute("name","1");
// }
// }
}
function dianjig(xuanbuxuan){
var zhuangtai = document.getElementsByClassName("check");
if (xuanbuxuan == "quanxuan") {
for(var i = 0;i < zhuangtai.length;i++){
zhuangtai[i].checked = true;
}
} else if(xuanbuxuan == "buxuan"){
for(var i = 0;i < zhuangtai.length;i++){
zhuangtai[i].checked = false;
}
} else{
for(var i = 0;i < zhuangtai.length;i++){
var djzt = zhuangtai[i].getAttribute("checked");
（（（zhuangtai[i].checked = zhuangtai[i].checked? false:true;）））（这是最简洁的方法）
（（（zhuangtai[i].checked?zhuangtai[i].checked = false :zhuangtai[i].checked = true;）））
if (zhuangtai[i].checked == true) {
zhuangtai[i].checked = false;
} else{
zhuangtai[i].checked = true;
}
}
}
}
</script>