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HomeWeb Front-endHTML Tutorial设置层的漂移_html/css_WEB-ITnose

设置层的漂移(float)

层与层在默认情况下不在同一水平线上显示,而是垂直显示,当需要多个层在同一水平线上时,按默认的值是不能达到多层在同一位置的,要设置多个层处于同一水平上平行,需要对层设置成为向左或者向右漂移,当层确定宽度后,多个层总宽度没有超过父对象的宽度时,会出现层漂移。设置层漂移用float表示

Float:none|left|right

None:默认值,对象不漂移

Left:文本流向对象的右边

Right:文本流向对象的左边

 

在使用float属性时要确定对象的宽度,默认情况下层对象的宽度为100%,即使使用的float也不会漂移,因为它没有多余的空间给下一个对象漂移,而设置对象的宽度后,剩下的宽度可以让给其他对象漂移到此位置,前提是有足够的空间。

 

注意:在html代码中,向右漂移的对象要写在向左漂移对象的前面,否则,达不到要设置漂移的目的

 

清除层的漂移范围

若使用float不当会出现网页不齐全,过多向左或向右漂移,这时可以使用clear,来清除不同方向的漂移,Clear表示控制float漂移,可以设置float的方向漂移对设置的方向对象有效性。

Clear:none|left|right|both

None:默认值,允许两边都可以有浮动对象

Left:不允许左边有浮动对象

Right:不允许右边有浮动对象

Both:不允许有浮动对象(clear:both;表示这个层不向两边漂移)

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