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老师批语：
编程实现盒模型的基本要素:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>08-16-盒子模型基本要素</title> </head> <style> </style> <body> 内容:content,边框:border,内边距:padding,外边距:margin <div style=" width: 200px; height: 200px; background-color: #0388F1; padding: 10px 20px;/*上下 左右*/ margin: 20px 10px 4px; /*padding: 10px 20px 30px; 第二个参数一定是左右*/ "> </div> </body> </html>
点击 "运行实例" 按钮查看在线实例
编程实现最常用的四种元素对齐方案:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>08-16-四种元素对齐方式</title>
</head>
<style>
.box1 {
width: 200px;
height: 200px;
background-color: #ff3c6d;
text-align: center; /*1 水平居中*/
}
.box1 a {
line-height: 200px; /*2 行高*/
}
.box2 {
width: 200px;
height: 200px;
background-color: #39FF1B;
text-align: center; /*1 水平居中*/
display: table-cell; /**/
vertical-align: middle; /*垂直居中*/
}
</style>
<body>
<div class="box1">
<a href="">PHP中文网</a>
</div>
<hr>
<div class="box2">
<span>PHP中文网</span><br>
<span>www.php.cn</span>
</div>
<hr>
子元素是块元素 <br>
a:水平居中:子元素设置左右外边距自动适应
<style>
.box3 {
width: 200px;
height: 200px;
background-color: lightgreen;
display: table-cell;
vertical-align: middle;
}
.box3 .child {
width: 100px;
height: 100px;
background-color: lightcyan;
margin: auto;
}
</style>
<div class="box3">
<div class="child"></div>
</div>
4.子元素是不定宽的块元素 <br>
a.水平居中:子元素转换为行元素,父级加:text-align:center
<style>
.box4 {
width: 200px;
height: 200px;
background-color: lightblue;
text-align: center;
display: table-cell;
vertical-align: bottom;
}
.box4 li {
display: inline;
}
ul {
margin: 0px;
padding-left:0px;
}
</style>
<div class="box4">
<ul>
<li><a href="">1</a></li>
<li><a href="">2</a></li>
<li><a href="">3</a></li>
<li><a href="">4</a></li>
<li><a href="">5</a></li>
</ul>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
3. 编程实现用五个色块制作一个十字架:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>08-16-十字方块</title>
</head>
<style>
body {
margin:0;
}
.box1{
width: 100px;
height: 100px;
background-color: black;
/*绝对定位元素,会脱离文档流*/
position: absolute;
left:100px;
}
.box2{
width: 100px;
height: 100px;
background-color: #39FF1B;
position: absolute;
top: 100px;
}
.box3{
width:100px;
height: 100px;
background-color: #ff3c6d;
position: absolute;
top: 100px;
left: 200px;
}
.box4{
width: 100px;
height: 100px;
background-color: #0388F1;
position: absolute;
top: 200px;
left: 100px;
}
</style>
<body>
<div class="box1"></div>
<div class="box2"></div>
<div class="box3"></div>
<div class="box4"></div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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