![[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
明星相册仿教材作业如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>明星相册</title>
<style type="text/css">
.box{
width: 500px;
height: 700px;
background: scroll:lightgray;
border: 1px solid;
margin: 20px auto;
text-align: center;
color: #363636;
box-sizing: 2px 2px 2px #999;
}
.box ul {
margin: 0;
padding: 0;
overflow:hidden;
}
.box ul li{
list-style: none;
float: left;
background-color: skyblue;
margin-left: 20px;
}
.box ul li a{
display: block;
width: 100px;
height: 40px;;
color:white;
text-decoration-line: none;
}
.box ul li a:hover{
font-size: 1.2em;
background-color: scroll;
}
.box .pic {
width: 450px;
height: 470px;
border: 1px solid lightgray;
line-height: 1px;margin: auto;
margin-top: 40px;
}
.box .pic img {
width: 100%;
height:100%;
}
</style>
</head>
<body>
<div>
<h2>明星相册</h2>
<ul>
<li>
<a href="../imges/fbb.jpg" title="《武媚娘》，《还珠格格》，《心中有鬼》..." onclick="changePic(this);return false" >范冰冰</a></li>
<li>
<a href="../imges/hg.jpg" title="《仙剑奇侠传3》，《神话》，《射雕英雄传》... "onclick="changePic(this);return false">胡歌</a></li>
<li>
<a href="../imges/zxc.jpg" title="《大话西游》，《美人鱼》，《功夫》..." onclick="changePic(this);return false">周星驰</a></li>
<li>
<a href="../imges/ldh.jpg" title="《赌侠》，《追龙》，《门徒》..." onclick="changePic(this);return false">刘德华</a></li>
<li>
<a href="../imges/rdh.jpg" title="《大追捕》，《冲锋战警》，《救火英雄》..."onclick="changePic(this);return false">任达华</a></li>
</ul>
<div>
<img src="../imges/zwt.png" alt="" id="img"></div>
<p id="info"></p>
</div>
<script type = "text/javascript">
function changePic(pic) {
//获取到要替换的明星图片与简介信息
var picUrl = pic.href
var picInfo = pic.title
var picName = pic.innerHTML
//获取到页面中,要被替换掉的图像元素对象
var img = document.getElementById('img')
var p = document.getElementById('info')
// 将对应的图像与信息占位符进行替换
img.src = picUrl
p.innerHTML = picName+':'+picInfo
p.innerHTML = '<span style="color:coral">'+picName+':'+picInfo+'</span>'
}
</script>
</body>
</html>
迷你计算机教材内容如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>3.迷你计算器</title>
<style type="text/css">
.box {
width: 500px;
height: 200px;
background-color: #efefef;
border: 1px solid lightgray;
text-align: center;
margin: auto;
margin: 20px auto;
color: #636363;
border-radius: 15px;
box-shadow: 2px 2px 2px #999;
}
table {
margin: auto;
/*border: 1px solid red;*/
}
td {
width: 100px;
height: 30px;
padding: 5px 10px;
}
input, select {
width: 100%;
height:100%;
border:none;
text-align: center;
/*background-color: cyan;*/
}
button {
width: 100%;
height: 100%;
border: none;
background-color: skyblue;
color: white;
}
button:hover {
cursor: pointer;
background-color: coral;
width: 105%;
height: 105%;
}
</style>
</head>
<body>
知识点:
<!-- 1.获取页面元素的方法; 2.条件判断语句的使用方法 3.事件方法函数的作用 -->
<div>
<h2>迷你计算器</h2>
<form>
<table>
<tr>
<td><input type="text" name="opt1" placeholder="操作数1"></td>
<td>
<select name="option">
<option value="null">请选择操作</option>
<option value="add"> + </option>
<option value="sub"> - </option>
<option value="mul"> * </option>
<option value="div"> / </option>
</select>
</td>
<td><input type="text" name="opt2" placeholder="操作数2"></td>
<td><button type="button">计算</button></td>
</tr>
<tr>
<td colspan="2"><h3>结果:</h3></td>
<td colspan="2"><h3 id="placeholder"></h3></td>
</tr>
</table>
</form>
</div>
<script type="text/javascript">
//1.获取操作数,按钮与结果占位符
var opt1 = document.getElementsByName('opt1')[0]
var opt2 = document.getElementsByName('opt2')[0]
var opt = document.getElementsByName('option')[0]
var btn = document.getElementsByTagName('button')[0]
var placeholder = document.getElementById('placeholder')
//2.给按钮添加事件,执行计算操作
btn.onclick = function(){
// var data1 = parseFloat(opt1.value)
// var data2 = parseFloat(opt2.value)
if (opt1.value.length == 0 ) {
alert('第一个操作数不能为空')
opt1.focus()
return false
} else if (isNaN(opt1.value)) {
alert('第一个操作数必须为数字')
opt1.focus()
return false
} else if (opt2.value.length == 0) {
alert('第二个操作数不能为空')
opt2.focus()
return false
} else if (isNaN(opt2.value)) {
alert('第二个操作数必须为数字')
opt2.focus()
return false
} else {
var data1 = parseFloat(opt1.value)
var data2 = parseFloat(opt2.value)
}
var option = opt.value
var temp = 0
var flag = ''
var result = ''
switch (option){
case 'null':
alert("请选择操作类型")
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 = '<span style="color:coral">'+data1+' '+ flag+' '+ data2+' = '+temp +'</span>'
var str = '<span style="color:coral">'
str += data1+' '+flag+' '+data2 + ' = ' + temp
str += '</span>'
placeholder.innerHTML = str
}
</script>
</body>
</html>
由于是赶作业的图片后面补上
