CSS 事件不工作

Question

我正在使用 asp.net4.0 并尝试通过使用 CSS 创建一个菜单栏， 当我运行程序时，移动和点击工作正常，但事件代码不知道为什么会发生这种情况

CSS 代码

    #main-nav{
        height:29px;
        float:left;
        background-image:url(images/nav-bg.gif);
        background-repeat:repeat-x;
        background-position:top left;
        width:100%;
    }

    #main-nav ul,
    #main-nav li{
        padding:0px;
        margin:0px;
        list-style-type:none;
    }

    #main-nav ul{
        height:29px;
        line-height:29px;
        background-image:url(images/nav-bar.gif);
        background-position:right;
        background-repeat:no-repeat;
        float:left;
        padding:0px 1px 0px 0px;
        margin:0px 0px 0px 10px;
    }

    #main-nav li{
        height:29px;
        line-height:29px;
        display:inline;
        position:relative;
        float:left;
        width:80px;
        text-align:center;
    }

    #main-nav li a{
        height:29px;
        width:80px;
        text-align:center;
        float:left;
        background-image:url(images/nav-bar.gif);
        background-position:left;
        background-repeat:no-repeat;
    }



    #main-nav li a:link,
    #main-nav li a:visited{
        color:#FFFFFF;
        text-decoration:none;
    }

    #main-nav li active{
        background-image:url(images/active.gif);
        background-repeat:no-repeat;
        background-position:left;
    }
    #main-nav li a:hover{
        background-image:url(images/active.gif);
        background-repeat:no-repeat;
        background-position:left;
    }

更新的 CSS 文件

#main-nav{
    height:29px;
    float:left;
    background-image:url(images/nav-bg.gif);
    background-repeat:repeat-x;
    background-position:top left;
    width:100%;
}

#main-nav ul,
#main-nav li{
    padding:0px;
    margin:0px;
    list-style-type:none;
}

#main-nav ul{
    height:29px;
    line-height:29px;
    background-image:url(images/nav-bar.gif);
    background-position:right;
    background-repeat:no-repeat;
    float:left;
    padding:0px 1px 0px 0px;
    margin:0px 0px 0px 10px;
}

#main-nav li{
    height:29px;
    line-height:29px;
    display:inline;
    position:relative;
    float:left;
    width:80px;
    text-align:center;
}

#main-nav li a{
    height:29px;
    width:80px;
    text-align:center;
    float:left;
    background-image:url(images/nav-bar.gif);
    background-position:left;
    background-repeat:no-repeat;
}



#main-nav li a:link,
#main-nav li a:visited{
    color:#FFFFFF;
    text-decoration:none;
}

#main-nav li a:active ,#main-nav li a:focus 
{
    color:Aqua;
    background-image:url(images/active.gif);
    background-repeat:no-repeat;
    background-position:left;

}
#main-nav li a:hover{
    background-image:url(images/active.gif);
    background-repeat:no-repeat;
    background-position:left;
}

Answer 1

没有active 标签。将其更改为:

#main-nav li a:active{
    background-image:url(images/active.gif);
    background-repeat:no-repeat;
    background-position:left;
}