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老师批语：
计算器代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>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;
}
input, select {
width: 100%;
height:50px;
border:none;
text-align: center;
background-color: white;
}
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>
<div class="box">
<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" align="right"><h3>结果:</h3></td>
<td colspan="2" align="left"><h3 id="placeholder"></h3></td>
</tr>
</table>
</form>
</div>
<script type="text/javascript">
// var opt1 =document.getElementsByname('opt1')[0]
// var opt2 =document.getElementsByname('opt2')[0]
// var opt = document.getElementsBygname('option')[0]
// var btn = document.getElementsByTagName('button')[0]
// var placeholder = document.getElementById('placeholder')
//
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')
btn.onclick = function(){
if (opt1.value.length == 0) {
alert('除数不能为0,请重新输入')
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 = ''
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>点击 "运行实例" 按钮查看在线实例
相册代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>相册</title>
<style type="text/css">
.box{
width: 666px;
height: 800px;
margin:50px auto;
text-align: center;
color: gray;
background-color: #efefef;
border: 1px solid gray;
border-radius: 50px ;
box-shadow:2px 2px 5px #999;
}
.box ul{
margin:0;
padding: 0;
overflow: hidden;
}
.box ul li{
list-style: none;
float: left;
margin-left: 48px;
background-color: skyblue;
width: 100px;
height: 40px;
}
.box ul li a{
display: block;
color: white;
text-decoration: none;
line-height: 40px;
}
.box ul li:hover{
font-size: 1.3em;
background-color: coral;
}
.box .pic{
width: 450px;
height:450px;
border: 1px solid lightgray;
line-height: 1px;
margin:0 auto;
margin-top: 80px;
}
.pic img{
width:100%;
height: 100%;
}
.pic:hover{
border-radius: 50%;
}
.pic img:hover{
border-radius: 50%;
}
</style>
</head>
<body>
<div class="box">
<h2>啦啦啦</h2>
<ul>
<li>
<a href="images/zly.jpg" title="《楚乔传》,《花千骨》,《陆贞传奇》..." onclick="shose(this);return false">小树的媳妇</a>
</li>
<li>
<a href="images/gyy.jpg" title="《倚天屠龙记》,《咱们经婚吧》,《爱无悔》..." onclick="shose(this);return false">猪哥的媳妇</a>
</li>
<li>
<a href="images/sl.jpg" title="《那年花开月正圆》,《甑环传》,《玉观音》..." onclick="shose(this);return false">朱老师的媳妇</a>
</li>
<li><a href="images/fbb.jpg" title="《还珠格格》,《武媚娘传奇》,《我不是潘金莲》..." onclick="shose(this);return false">老班的媳妇</a></li>
</ul>
<div class="pic">
<img src="images/zwt.png" alt="" id="img">
</div>
<p id='info'></p>
</div>
<script type="text/javascript">
function shose(picc) {
var wang = picc.href
var bao = picc.title
var xi = picc.innerHTML
var img = document.getElementById('img')
var p = document.getElementById('info')
// alert(wang)
img.src = wang
p.innerHTML = xi+':'+bao
p.innerHTML = '<span style="color:coral">'+xi+':'+bao+'</span>'
}
</script>
</html>点击 "运行实例" 按钮查看在线实例
手写代码：
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