html：
<body>
<div class="container">
<div id="divtest"></div>
<span>kkk</span>
<span>sadaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaasadaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
sadaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaasadaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaasadaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
sadaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaasdgsdgs
sadaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
</span>
</div>
</body>
css：
divtest {
width:200px;
height:30px;
background-color:red;
float:left;
}
span
{
float:right;
}
test {
clear:both;
}
.container
{
background-color:gray;
}
.container:after {
content:".";
height:0;
visibility:hidden;
display:block;
clear:both;
}
不过过有更简单的办法：
去掉：
.container:after {
content:".";
height:0;
visibility:hidden;
display:block;
clear:both;
}
然后：
.container
{
background-color:gray;
overflow:auto;//或者hidden也是可以的
}
