结果应该是a把b遮盖了。c在下面。
你要什么结果？正常情况不会遮住，因为z-index同层，默认position:static；而不是position: absolute
按书本的意思
我也是新手，感觉是B块在A 的下面了，如果想要让B块跟随在A的后面应该是给B加一个float：left；
<html> <head> <style type="text/css"> #a,#b,#c { width:100px; height:100px; background:red; } #b { float:left; } #b{background:yellow;} #c{background:blue;} </style> </head> <body> <div id="a">a</div> <div id="b">b</div> <div id="c">c</div> </body> </html> 我也做了下测试
如果b不浮动的话
就会被a所覆盖
书本不完全是对的
可能书太老了。
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