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序号 HTML IE<=7 CSS样式 表现: 实际高度 (px) 说明 1 <div></div>

0 啥事没有 2 <div></div>
width:100px;
15 触发haslayout 3 <div></div>
height:1px;
0 4 <div></div>
overflow:hidden;
15 触发haslayout   5 <div></div>
width:100px; height:0px;
0 6 <div></div>
width:100px; line-height:0px
15 7 <div></div>
width:100px; font-size:0;
2 8 <div></div>
width:100px; height:0px; line-height:0px;