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border-radius:50px;   边框半径  CSS度量值都:em、px、百分比<br />如果设置1个值,表示4个圆角都使用这个值。如果设置两个值,表示左上角和右下角使用第一个值,右上角和左下角使用第二个值。如果设置三个值,表示左上角使用第一个值,右上角和左下角使用第二个值,右下角使用第三个值。如果设置四个值,则依次对应左上角、右上角、右下角、左下角(顺时针顺序)。<br /><br /><br />border-radius还可以用斜杠设置第二组值。这时,第一组值表示水平半径,第二组值表示垂直半径。第二组值也可以同时设置1到4个值,应用规则与第一组值相同。
border-radius:50px/25px;<br /><br />border-radius: 100px 25px 80px 5px / 45px 25px 30px 15px;<br /><br /><br /><br />

除了同时设置四个圆角以外,还可以单独对每个角进行设置。对应四个角,CSS3提供四个单独的属性:

  * border-top-left-radius

  * border-top-right-radius

  * border-bottom-right-radius

  * border-bottom-left-radius

这四个属性都可以同时设置1到2个值。如果设置1个值,表示水平半径与垂直半径相等。如果设置2个值,第一个值表示水平半径,第二个值表示垂直半径。

 

border-top-left-radius: 50px;

border-top-left-radius: 50px 100px;//第一个值表示水平半径,第二个值表示垂直半径

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