相册:
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实例
<html lang="en">
<head>
<meta charset="UTF-8">
<title>2.实战:明星相册</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 #999;
}
.box ul {
margin:0;
padding:0;
overflow: hidden;
}
.box ul li {
list-style-type: none;
float:left；
background-color: skyblue;
margin-left: 20px;
}
.box ul li a {
display: block;
width: 100px;
height: 40px;
line-height: 40px;
color: red;
text-decoration: none;
}
.box ul li:hover {
font-size:1.2em;
background-color: coral;
}
.box .pic {
width: 450px;
height:450px;
border: 1px solid lightgray;
line-height: 1px;
margin: auto;
margin-top: 50px;
}
.box .pic img {
width: 100%;
height: 100%;
}
.box .pic img:hover {
}
</style>
</head>
<body>
<div class="box">
<h2>明星相册</h2>
<ul>
<li>
<a href="../images/zly.jpg" title="《楚乔传》,《花千骨》,《陆贞传奇》..." onclick="changePic(this);return false">赵丽颖</a>
</li>
<li>
<a href="https://ss2.baidu.com/6ONYsjip0QIZ8tyhnq/it/u=3802769585,1517263243&fm=58" title="《仙剑奇侠传》,《神话》..." onclick="changePic(this);return false">胡歌</a>
</li>
<li>
<a href="https://ss2.baidu.com/6ONYsjip0QIZ8tyhnq/it/u=3376675274,1867520384&fm=58&w=121&h=140&img.JPEG&bpow=400&bpoh=613" title="《枪王之王》,《使徒行者》.." onclick="changePic(this);return false">古天乐</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 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>
运行实例 »
点击 "运行实例" 按钮查看在线实例计算器：
<html>
<head>
<title>计算器</title>
</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"> //Js 获取html 里面的name 值熟悉 并且取属猪里的第一个
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(){ //事件函数定义
if (opt1.value.length == 0 ) { //判断 选项框1 是否为空值
alert('第一个操作数不能为空')
opt1.focus()
return false //程序截止
} else if (isNaN(opt1.value)) { //判断值是否不是数字
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) //字符串转数字
var data2 = parseFloat(opt2.value)
}
var option = opt.value //选项框值
var temp = 0
var flag = '' //先设置为空
var result = ''
switch (option){ // switch 判断 其中的一样case 是以option 选项框为依据
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:red">' //输出结果
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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