1、CSS中的clear有四個參數：
none：允許兩邊都可以浮動。
left：不允許左邊有浮動。
right：不允許右邊有浮動。
both(預設)；不允許有浮動。
2、一開始在CSS中clear浮動是預設both，也就是說一開始不能有浮動的。
3、使用的案例：假設我清除第三個p的浮動
<style type="text/css">p{ border:1px solid red; float:left; clear:none; } #msg_p{ width:600px; height:600px; } .one{ width:100px; height:90px; } .two{ width:100px; height:90px; } .three{ width:100px; height:90px; clear:left; } .four{ width:100px; height:90px; } .five{ width:100px; height:90px; } </style><body><p id="msg_p"><p class="one"></p><p class="two"></p><p class="three"></p><p class="four"></p><p class="five"></p></p></body>
效果：
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