运行代码框 style body {margin:100px;} #login_b {width:200px;height:200px;background:#000;-moz-opacity:0.2; filter:alpha(opacity=20);margin:-30px 0 0 600px; position:absolute;} #login_t { z-index:10;border:1px solid #006600;width:200px;height:200px;background:#...

style p { background-color:expression(altBgcolor(this)); } /style script type = text/javascript function altBgcolor(elem) { elem.style.background-color = (new Date()).getHours() % 2 ? #F08A00 : B8D4FF; } /script 6）尽量使用 PNG 。PNG 比 GI...