2014阿里巴巴web前端实习生试题分析(1)
简化以下CSS代码:
div.container{ width:500px; background-image:url(/img/sprite.png); background-repeat:no-repeat; background-position:0px -78px; } div.container ul#news-list,div.container ul#news-list li{ margin:0px;padding:0px; } div.container ul#news-list li{ padding-left:20px; background-image:url(/img/sprite.png); background-position:-120px opx; } A{ font-size:14px; font-weight:bold; line-height:150%; color:#000000; }
答案:
div.container{ width:500px; background-image:url(/img/sprite.png); background-repeat:no-repeat; background-position:0px -78px; } div.container ul#news-list,div.container ul#news-list li{ margin:0px;padding:0px; } div.container ul#news-list li{ padding-left:20px; background-image:url(/img/sprite.png); background-position:-120px opx; } A{ font-size:14px; font-weight:bold; line-height:150%; color:#000000; } div.container{ width:500px; background:url(/img/sprite.png) no-repeat 0 -78px; } #news-list,#news-list li{ margin:0 padding:0; } #news-list li{ padding-left:20px;background:url(/img/sprite.png)no-repeat -120px 0; }
分析:CSS简写用法介绍
(1)CSS中font简写:
font:italicsmall-capsbold12px/1.5emarial,verdana;等效于:
font-style:italic; font-variant:small-caps; font-weight:bold; font-size:12px; line-height:1.5em; font-family:arial,verdana;
顺序:font-style|font-variant|font-weight|font-size|line-height|font-family
(2)CSS中background简写:
background:#fffurl(bg.gif)no-repeatfixedlefttop;等效于:
background-color:#fff; background-image:url(bg.gif); background-repeat:no-repeat; background-attachment:fixed; background-position:lefttop;
顺序:background-color|background-image|background-repeat|background-attachment|background-position
(3)CSS中margin&padding简写:
border:1pxsolid#000;等效于:
border-width:1px; border-style:solid; border-color:#000;
(4)CSS中list-style简写:
list-style:squareoutsideurl(bullet.gif);等效于:
list-style-type:square; list-style-position:outside; list-style-image:url(bullet.gif)
顺序:list-style-type|list-style-position|list-style-image
(5)四边的简写一般如下:
padding:1px2px3px4px;等效于:
padding-top:1px; padding-right:2px; padding-bottom:3px; padding-left:4px;
不论是边框宽度,还是边框颜色、边距等,只要CSS样式涉及四边,顺序通通都是“上右下左”(顺时针方向)。
5.1)如果四边的值省略一个,只写三个:
padding:1px2px3px;则等效于省略的“左值”等于“右值”:
padding-top:1px; padding-right:2px; padding-bottom:3px; padding-left:2px;
5.2)如果四边的值省略两个:
padding:1px2px;则等效于:省略的左值等于右值,上值等于下值
padding-top:1px; padding-right:2px; padding-bottom:1px; padding-left:2px;
5.3)只有一个值
Padding:1px:则等效于:
padding-top:1px; padding-right:1px; padding-bottom:1px; padding-left:1px;
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