Why does the following div cover the previous div? If float:left is also added to the back, it will not be covered_html/css

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Why does the following div cover the previous div? If float:left is also added to the back, it will not be covered_html/css_WEB-ITnose

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Jun 24, 2016 pm 12:22 PM

float:left; HTML css div

#divmain{
margin:0 auto;
width:470px;
}
#div1{
float:left;
width:100px;
height:100px;
background:#006;
}
#div2{

width:100px;
height:100px;
background:#CCC;

}

无标题文档

10

回复讨论(解决方案)

以后代码要用代码框编辑，要不然这样人家看也不方便。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><style type="text/css">#divmain{margin:0 auto;width:470px;background:#999;}    #div1{float:left;margin:0 auto 0 20px;width:100px;height:100px;background:#fff;/* z-index=-1;*/} #div2{width:100px;height:100px;background:#CCC;}        </style><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>无标题文档</title></head><body><div id="divmain">52345623546<div id="div1">10</div><div id="div2">20345345</div></div></body></html>

Copy after login

这样子看起来比较明显，因为float之后div1脱离正常流，所以浮动在其他div之上。如果你把div2也变成float那么，div1，div2就变成同样的了，div2就浮动在div1之后，详情请参见css权威指南关于float的说明。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><style type="text/css">#divmain{margin:0 auto;width:470px;background:#999;}    #div1{float:left;margin:0 auto 0 20px;width:100px;height:100px;background:#fff;/* z-index=-1;*/} #div2{width:100px;height:100px;background:#CCC;}        </style><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>无标题文档</title></head><body><div id="divmain">52345623546<div id="div1">10</div><div id="div2">20345345</div></div></body></html>

Copy after login

这样子看起来比较明显，因为float之后div1脱离正常流，所以浮动在其他div之上。如果你把div2也变成float那么，div1，div2就变成同样的了，div2就浮动在div1之后，详情请参见css权威指南关于float的说明。

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