webveuje/csspress/demo2/zixiangfujue.html
2021-01-18 18:34:44 +08:00

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
div {
width: 60px;
height: 60px;
}
.box1 {
width: 200px;
height: 200px;
background: yellow;
margin: 20px;
/* position:static */
position: relative;
}
.box2 {
background: red;
position: absolute;
top: 10px;
left: 20px;
}
</style>
</head>
<body>
<div class="box1">
<div class="box2"></div>
</div>
<p>
<p>两个div都是绝对定位时这里红色的div是依据 body定位的而不是根据父元素黄色的div 定位,</p>
<p> 加上position static 后也是根据body 定位,</p>
<p>当父元素的Position声明为 absolute 时,红色会依据父级黄色定位,但是会超脱文档流,影响下面的元素</p>
</p>
<p>
总结2 父元素是相对定位 子元素是绝对定位时,不会扰乱整体的布局而且可以使子元素依据父元素边缘定位
</p>
</body>
</html>