谁能解释一下，为什么使用 relative是设置right,bottom 后，看不到div 呀，哪里多出来的 top , left 属性负值呀？chrome 中修改后，同样，设置 left,top 后， 多出来 right/bottom 的负值属性？源码：<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>CSS 定位：relative && absolute</title>
<style>
.relative{
background-color: #0f0;
width: 100px;
height: 100px;
position: relative;
right: 200px;
bottom: 200px;
}
</style>
</head>
<body>
<div>
<div>
<!-- -->
</div>
</div>
</body>
</html><!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>CSS 定位：relative && absolute</title>
<style>
.relative{
background-color: #0f0;
width: 100px;
height: 100px;
position: relative;
left: 200px;
top: 200px;
}
</style>
</head>
<body>
<div>
<div>
<!-- -->
</div>
</div>
</body>
</html>
5 回答
UFO2015
TA贡献27条经验 获得超23个赞
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>CSS 定位：relative && absolute</title>
<style>
*{
margin: 0;
padding: 0;
}
html,body{
width: 100%;
height: 100%;
background: rgba(0,0,0,0.3);
color: red;
box-sizing: border-box;
overflow: hidden;
}
.box{
width: 1000px;
height: 600px;
border: 1px solid red;
/*overflow: hidden;*/
}
.box .relative{
background-color: #f0f;
width: 100px;
height: 100px;
position: relative;
right: 50px;
bottom: 50px;
/*
position: relative; 浏览器，自动补全 :
left == -right;
top == -bottom;
*/
}
.box .relative-new{
background-color: #0f0;
width: 100px;
height: 100px;
position: relative;
right: 0;
bottom: 0;
}
</style>
</head>
<body>
<div class="box">
<div class="relative">
<h3>relative</h3>
</div>
<div class="relative-new">
<h3>relative-new</h3>
</div>
</div>
</body>
</html>
UFO2015
TA贡献27条经验 获得超23个赞
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>CSS 定位：relative && absolute</title>
<style>
*{
margin: 0;
padding: 0;
}
html,body{
width: 100%;
height: 100%;
background: rgba(0,0,0,0.3);
color: red;
box-sizing: border-box;
overflow: hidden;
}
.box{
width: 1000px;
height: 600px;
border: 1px solid red;
/*overflow: hidden;*/
}
.box .relative{
background-color: #0f0;
width: 100px;
height: 100px;
position: relative;
right: 100px;
bottom: 100px;
/*
*/
}
.box .relative-new{
background-color: #0f0;
width: 100px;
height: 100px;
position: relative;
left: 100px;
top: 100px;
}
.box .absolute{
background-color: #0f0;
width: 100px;
height: 100px;
position: absolute;
right: 100px;
bottom: 100px;
/*
position:absolute;
right: 200px;
bottom: 200px;
这样才好使！
//position:absolute; float脱离文档流
*/
}
</style>
</head>
<body>
<div class="box">
<div class="relative">
<h3>relative</h3>
</div>
<div class="relative-new">
<h3>relative-new</h3>
</div>
<div class="absolute">
<h3>absolute</h3>
</div>
</div>
</body>
</html>
qq_世界因你颤抖_0
TA贡献3条经验 获得超0个赞
首先你应该是没有理解relative和position的意思，你在<style>里的那个“top”和“left”没有意义。
relative相当于定义一个容器，它是一个参照点。
position相当于内容，装在容器里。
<style>
.box{
width:100px;
height:100px;
background-color:#ff0000;
position:absolute;
left:200px;
top:200px;
}
</style>
<body>
<div class = "relative ">
<div class = "position">
</div>
</div>
</body>
另外附上慕课网绝对定位的学习课程，简短易懂，http://www.imooc.com/learn/95
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