absolute; left"center">:absolute;<div div .center{position;
left; class="<
.right{position.box{position;top; /div><>top,
<用定位做;top:0;> div :0;<}
; ><box"/div>:0;
left;
<<.left{position; :0;class="left:relative;}
中间填写你第一块的宽
或者你用浮动做;/div>:; right"class="class="}
;/div>}
;
 :absolute;div :0