css background ver
请问css中BACKGROUND: url(img/passport/login/bg_top.jpg?ver=2)中ver=2是什么意思如题，谢谢！
回复讨论(解决方案)
.navigation { HEIGHT: 50px; BACKGROUND: url(img/passport/login/bg_top.jpg?ver=2) repeat-x; POSITION: fixed; Z-INDEX: 2000; TOP: 0px; WIDTH: 100%; box-shadow: 0 0 5px 3px #888; _position: absolute} 这个css完整的如上，应该是设置一个不动的导航条，
最后部分 _position: absolute 这个_position与POSITION: fixed;的区别是什么
_position: absolute 是IE6下HACK的写法. 意思就是只有IE6使用它;
bg_top.jpg?ver=2 这一个版本,cdn 加速相关的?.
我加上ver=2后，这个背景就看不到了。这个是什么用
我加上ver=2后，这个背景就看不到了。这个是什么用
呵呵.你加v=??什么都可以看到的.
记得前面的?
img/passport/login/bg_top.jpg?ver=2
没明白，ver=2什么意思啊？！
从字面上看version的意思。
但我没看过这样的用法，直接无视。
怀疑写错了吧？或者自动生成的？
img/passport/login/bg_top.jpg?ver=1
img/passport/login/bg_top.jpg?ver=2
img/passport/login/bg_top.jpg?ver=3
img/passport/login/bg_top.jpg?ver=4
img/passport/login/bg_top.jpg?ver=5
指定图片的url版本 防止更新的缓存
谢谢大家的回答，指定了图片的版本，有什么用呢？
to kk3k2005:
不理解“防止更新的缓存”这句是什么意思?
就好比a.html?a=123一样 a.jpg?b=123也是需要浏览器发送请求的
URL后面的参数有什么用就得看处理这个request的程序怎么处理了
能正确读取图片的路径罢了
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