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老师批语：关于盒模型, 一定要牢记它的基本样式
9月2日作业:
1. 实例演示:<iframe>标签的使用
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>内联框架标签</title> </head> <body> <h1>内联框架演示</h1> <a href="https://baidu.com" target="main">百度</a> <iframe src="https://baidu.com" frameborder="1" width="500" name="main"> </iframe> </body> </html>
点击 "运行实例" 按钮查看在线实例
2. 实例演示: css样式设置的优先级
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<link rel="stylesheet" href="style.css">
<title>css样式设置的优先级</title>
<style>
p{
color:pink;
}
</style>
</head>
<body>
<p>林志玲嫁给了一个***人</p>
<p style="color: blue;">苍老师是一个***人</p>
<p>波波姐也是一个***人</p>
</body>
</html>点击 "运行实例" 按钮查看在线实例
3. 实例演示: css的id, class与标签选择器的使用规则
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>css的id, class与标签选择器的使用规则</title>
<style>
#red{
color:red;
}
.green{
color:green;
}
p{
color:blueviolet;
}
</style>
</head>
<body>
<p class="green" id="red">原来css非常简单</p>
<script>
document.getElementsByTagName('p').item(0).style.color='blue';
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例
4. 实例演示盒模型的五大要素: width, height, padding, border, margin(margin可暂忽略)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<link rel="stylesheet" href="style2.css">
<title>盒模型的五大要素: width, height, padding, border, margin</title>
<style>
.box1{
width: 400px;
height: 400px;
background-color:lightblue;
margin: 0 auto;
}
.box2{
padding:50px;
width: 260px;
height: 260px;
background-color:red;
border:1px solid #040bec;
margin:55px auto;
color:white;
}
</style>
</head>
<body>
<div class="box1">
<div class="box2">中国人民解放军</div>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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