<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
#er>li{
background-image: url('bhu123.jpg');
}
li{
width: 100px;
height: 120px;
border: 1px solid black;
}
ul{
float: left;
}
nav{
width: 300px;
height: 300px;
border: 1px solid black;
position: relative;
}
nav>div{
width: 100%;
height: 300px;
border: 1px solid black;
position: absolute;
}
img{
width: 100%;
height: 100%;
}
.nji{
opacity: 0;
}
.nji1{
opacity: 1;
}
.xcv{
opacity: 1;
}
</style>
</head>
<body>
<!-- 切换图片 案例 ： 1 -->
<button id="er">照片1</button>
<button id="cv">照片2</button>
<img id="is" src="" width="1000px",>
<script>
var img1=document.getElementById('is')
var lll=document.getElementById('er');
var ko=document.getElementById('cv')
lll.onclick = function () {
img1.src='R-C (1).jpg' //改元素自带的属性
img1.title='图片1'
}
ko.onclick = function () {
img1.src='R-C (2).jpg'
img1.title='图片2'
}
</script>
<!-- 案例2 根据时间 分别 图片是 早上 中午 下午 晚上 -->
<h1 id="fg"></h1>
<script>
var time= new Date();
var nji=document.getElementById('fg')
if (time.getHours()>=10){
nji.innerHTML='早上好'
}else if(time.getHours()<=13){
nji.innerHTML='中上好'
}else if (time.getHours()<=17){
nji.innerHTML='下午好'
}else {
nji.innerHTML='晚上好'
}
</script>
<!-- 案例 3 密码的隐藏和查看-->
<!-- 点击变成 text文本框 点击变成 password文本框 -->
<input type="password" id="lp">
<button id="asd">查看密码</button>
<button id="asd1">隐藏密码</button>
<script>
var pawws=document.getElementById('asd')
var t1=document.getElementById('lp')
pawws.onclick =function (){
t1.type='text'
}
var pawws1=document.getElementById('asd1')
var t1=document.getElementById('lp')
pawws1.onclick =function (){
t1.type='password'
} -->
</script>
<!-- 二维码 删除 显示 -->
<button id="zxc">删除</button>
<button id="zxc1">显示</button>
<div>
<img src="ZDADD.png" alt="" id="vb">
</div>
<script>
var zxc_qwe=document.getElementById('zxc')
var imgs=document.getElementById('vb')
zxc_qwe.onclick =function(){
imgs.style.opacity='0'
}
var zxc_qwe1=document.getElementById('zxc1')
var imgs=document.getElementById('vb')
zxc_qwe1.onclick =function(){
imgs.style.opacity='1'
}
</script>
<!-- 小图标 精灵图的练习-->
<ul id="er">
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul> -->
<script>
var nji=document.getElementById('er').querySelectorAll('li');
console.log(nji);
for (var koko=0;koko<=nji.length;koko++){
var mk=koko*134
nji[koko].style.backgroundPosition='0 -'+mk+'px';
}
</script>
<!-- 隐藏文本框内容 获取到焦点 显示手机 焦点没获取 显示焦点 --> -->
<input type="text" value="手机">
<script>
var text =document.querySelector('input')
text.onfocus =function (){
if (this.value=='手机'){
this.value=''
//如果有内容==手机的话 为空
// 获取到焦点的时候
}
}
text.onblur=function(){
// 失去焦点的时候 如果为空 就赋值为空
if (this.value==''){
this.value='手机'
}
}
</script>
</body> </html>
标签：function,nji,getElementById,js,案例,点击,onclick,var,document From： https://www.cnblogs.com/xxh12/p/16786428.html