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1.使用css缩写

使用缩写可以帮助减少你CSS文件的大小,更加容易阅读。css缩写的主要规则请参看《常用css缩写语法总结》,css缩写的主要规则如下:

颜色

16进制的色彩值,如果每两位的值相同,可以缩写一半,例如:
#000000可以缩写为#000;#336699可以缩写为#369;

注意:在同一个CSS配置节中,不要交错使用全写和缩写的颜色配置,在系统资源极低时,会导致浏览器渲染失败。

盒尺寸

通常有下面四种书写方法:

  • property:value1; 表示所有边都是一个值value1;
  • property:value1 value2; 表示top和bottom的值是value1,right和left的值是value2
  • property:value1 value2 value3; 表示top的值是value1,right和left的值是value2,bottom的值是value3
  • property:value1 value2 value3 value4; 四个值依次表示top,right,bottom,left
  • 方便的记忆方法是顺时针,上右下左。具体应用在margin和padding的例子如下:
    margin:1em 0 2em 0.5em;

     

    边框(border)

    边框的属性如下:

  • border-width:1px;
  • border-style:solid;
  • border-color:#000;
  • 可以缩写为一句:border:1px solid #000;

    语法是border:width style color;

    背景(Backgrounds)

    背景的属性如下:

  • background-image:url(background.gif);
  • background-repeat:no-repeat;
  • background-attachment:fixed;
  • background-position:0 0;
  • 可以缩写为一句:background:#f00 url(background.gif) no-repeat fixed 0 0;

    语法是background:color image repeat attachment position;

    你可以省略其中一个或多个属性值,如果省略,该属性值将用浏览器默认值,默认值为:

  • color: transparent
  • image: none
  • repeat: repeat
  • attachment: scroll
  • position: 0% 0%
  • http://roucheng.cnblogs.com/

    字体(fonts)

    字体的属性如下:

  • font-style:italic;
  • font-variant:small-caps;
  • font-weight:bold;
  • font-size:1em;
  • line-height:140%;
  • font-family:"Lucida Grande",sans-serif;
  • 可以缩写为一句:font:italic small-caps bold 1em/140% "Lucida Grande",sans-serif;

    注意,如果你缩写字体定义,至少要定义font-size和font-family两个值。

    列表(lists)

    取消默认的圆点和序号可以这样写list-style:none;,

    list的属性如下:

  • list-style-type:square;
  • list-style-position:inside;
  • list-style-image:url(image.gif);
  • 可以缩写为一句:list-style:square inside url(image.gif);

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