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相册练习
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>3.29</title>
<style type="text/css">
.box{
width: 500px;
height: 700px;
background-color: #efefef;
border: 1px solid lightgray;
margin: 20px auto;
text-align: center;
color: #636363;
box-shadow: 2px 2px 2px #ccc;
}
.box ul{
margin: 0;
padding: 0;
overflow: hidden;
}
.box ul li{
list-style: none;
float: left;
background-color: skyblue;
margin-left: 20px;
-moz-border-radius: 5px;
-webkit-border-radius: 5px;
}
.box ul li a{
display: block;
width: 100px;
height: 40px;
line-height: 40px;
text-decoration: none;
color: white;
-moz-border-radius: 5px;
-webkit-border-radius: 5px;
}
.box ul li a:hover{
background-color: coral;
}
.box .pic{
width: 450px;
height: 450px;
border: 1px solid lightgray;
vertical-align: middle;
margin: auto;
margin-top: 50px;
}
.pic img{
width: 100%;
height: 100%;
}
</style>
</head>
<body>
<div class="box">
<h2>相册</h2>
<ul>
<li><a href="images/1.jpg" title="君埋泉下泥销骨，我寄人间雪满头" onclick="changePic(this);return false">梦微之</a></li>
<li><a href="images/2.jpg" title="人言落日是天涯，望极天涯不见家" onclick="changePic(this);return false">春日</a></li>
<li><a href="images/3.jpg" title="故园书动经年绝，华发春唯满镜生" onclick="changePic(this);return false">乡思之</a></li>
<li><a href="images/4.jpg" title="一夕轻雷落万丝，霁光浮瓦碧参差" onclick="changePic(this);return false">春熙</a></li>
</ul>
<div class="pic"><img src="images/zwt.png" id="img"></div>
<p id="info"></p>
</div>
<script type="text/javascript">
function changePic(pic){
var picUrl = pic.href
var picInfo = pic.title
var picName = pic.innerHTML
var img = document.getElementById('img')
var p = document.getElementById('info')
img.src = picUrl
p.innerHTML = picName+':'+picInfo
p.innerHTML = '<span style="color:coral">'+picName+':'+picInfo+'</span>'
}
</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>4</title>
<style type="text/css">
.box{
width: 500px;
height: 200px;
background-color: #efefef;
border: 1px solid lightgray;
text-align: center;
margin: 20px auto;
color: #636363;
border-radius: 15px;
box-shadow: 2px 2px 2px #999;
}
table{
margin: auto;
}
td{
width: 100px;
height: 30px;
padding: 5px 10px;
}
input,select{
width:100%;
height: 100%;
border: none;
text-align: center;
}
button{
width: 100%;
height: 100%;
border: none;
background-color: skyblue;
color: white;
}
button:hover{
cursor: pointer;
background-color: coral;
}
</style>
</head>
<body>
<div class="box">
<h2>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.getElementsByName('option')[0]
var btn = document.getElementsByTagName('button')[0]
var placeholder = document.getElementById('placeholder')
btn.onclick = function(){
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
}
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
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