![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Correction status：Uncorrected
Teacher's comments：
Collection
Collection
相册
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>相册</title>
<style type="text/css">
.box{
width: 500px;
height: 650px;
background-color: #e2e2e2;
border: 1px solid skyblue;
margin: 20px auto;
text-align: center;
color: #636363;
}
.box ul{
margin: 0;
padding: 0;
overflow: hidden;
}
.box ul li{
border: 1px solid skyblue;
list-style: none;
float: left;
margin-left: 20px;
}
.box ul li a{
display: block;
width: 100px;
height: 40px;
line-height: 40px;
color: #fff;
text-decoration: none;
background-color: skyblue;
}
.box ul li a:hover{
font-size: 1.2em;
background-color: coral;
}
.box .pic{
width: 340px;
height:350px;
border: 1px solid skyblue;
line-height: 1px;
margin: auto;
margin-top: 50px;
}
.box .pic img{
width: 100%;
height: 100%;
}
#info{
margin:auto;
margin-top: 50px;
height: 30px;
}
</style>
</head>
<body>
<div class="box">
<h2>相册</h2>
<ul>
<li>
<a href="../img/1.png" title="《楚乔传》,《花千骨》,《陆贞传奇》..." onclick="changePic(this);return false">赵丽颖</a>
</li>
<li><a href="../img/1.png" title="《倚天屠龙》,《花千骨》" onclick="changePic(this);return false">高圆圆</a></li>
<li><a href="../img/10.png" title="《那年花开月正圆》,《花千骨》" onclick="changePic(this);return false">孙俪</a></li>
</ul>
<div class="pic">
<img src="../img/2.png" alt="" id="img">
</div>
<p id="info"></p>
</div>
<script type="text/javascript">
function changePic(pic){
// 1获取图片和标题
// 一定要加上形参pic
var picimg = pic.href
var picinfo = pic.title
var picName = pic.innerHTML
// innerHTML可以获取标签中的内容
// 2获取替换的图片和标题
var img = document.getElementById('img')
var p = document.getElementById('info')
// 2 = 1
img.src = picimg
// 将名字和标题一起替换到P中
// js用+ 连接
p.innerHTML = picName+':'+picinfo
}
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例
计算器
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
.box{
width: 400px;
height: 200px;
background-color: #e2e2e2;
border: 1px solid skyblue;
margin: 20px auto;
text-align: center;
color: #636363;
}
.box3{
margin:auto;
margin-top: 20px;
border: 1px solid skyblue;
width: 200px;
height: 35px;
text-align: left;
line-height: 35px;
}
.box3 p{
display: inline;
width: 100%;
height: 100%;
}
</style>
</head>
<body>
<div class="box">
<h2>计算器</h2>
<form class="box2">
<input type="text" name="opt1" size="10">
<select name="option">
<option value="null">請選擇</option>
<option value="add">+</option>
<option value="sub">-</option>
<option value="mul">*</option>
<option value="div">/</option>
</select>
<input type="text" name="opt2" size="10">
<input type="button" name="button" value="計算" id="btn">
</form>
<div class="box3">結果：<p id="placeholder">1111</p></div>
</div>
<script type="text/javascript">
// 获取要用到的操作数
var opt1 = document.getElementsByName('opt1')[0]
var opt2 = document.getElementsByName('opt2')[0]
var opt = document.getElementsByName('option')[0]
var btn = document.getElementsByName("button")[0]
var placeholder = document.getElementById("placeholder")
// 给按钮添加事件
btn.onclick = function(){
if(opt1.value.length ==0){
opt1.focus();
return false
}else if(isNaN(opt1.value)){
return false
}else if(opt2.value.length ==0){
opt2.focus();
return false
}else if(isNaN(opt2.value)){
return false
}else{
var data1 = parseFloat(opt1.value)
var data2 = parseFloat(opt2.value)
}
// 以上是判断
// 先开始进行计算
var option = opt.value
var temp = 0
var flag = ''
var result = ''
switch(option){
case'null':
opt.focus;
return false
case 'add':
flag = '+'
temp = data1 + data2
break
case 'sub':
flag = '-'
temp = data1 - data2
break
case'mul':
flag='*'
temp = data1*data2
break
case 'div':
flag = '/'
if (data2 == 0) {
alert('除数不能为0,请重新输入')
opt2.focus()
return false
} else {
temp = data1 / data2
}
break
}
// placeholder.innerHTML = data1+''+flag+''+data2+'='+temp
var str ;
str = data1+' '+flag+' '+data2 + ' = ' + temp
placeholder.innerHTML = str
}
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例
