<div id="div1"></div>
<div id="div2"></div>
<div id="div3"></div>
#div1{
height:500px;
float:left;
}
#div2{
height:500px;
width:1000px;
float:left;
}
#div3{
height:500px;
float:left;
float:left;
}
div2的宽度为定长，怎么设置div1和div2的宽度相等且等于页面总宽度减去div2的宽度的一半，最好给出个具体代码
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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">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
<title> 页面名称 </title>
<style type="text/css">
#div1{
height:500px;
float:left;
width: calc( (100% - 1000px) / 2 );
background-color: #9f6;
}
#div2{
height:500px;
width:1000px;
float:left;
background-color: #f90;
}
#div3{
height:500px;
float:left;
width: calc( (100% - 1000px) / 2 );
background-color: #0ff;
}
</style>
</head>
<body>
<div id="box">
<div id="div1"></div>
<div id="div2"></div>
<div id="div3"></div>
</div>
</body>
</html>
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