css中background和_background属性的区别css样式表中有如下语句:.imminbox { width:39px; height:29px;padding-right:3px; cursor:pointer; position:absolute ;right:1px; bottom:0px;z-index:20; overflow:visible; background:url(../images/im_mi
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![css中background和_background属性的区别css样式表中有如下语句:.imminbox { width:39px; height:29px;padding-right:3px; cursor:pointer; position:absolute ;right:1px; bottom:0px;z-index:20; overflow:visible; background:url(../images/im_mi](/uploads/image/z/6935471-71-1.jpg?t=css%E4%B8%ADbackground%E5%92%8C_background%E5%B1%9E%E6%80%A7%E7%9A%84%E5%8C%BA%E5%88%ABcss%E6%A0%B7%E5%BC%8F%E8%A1%A8%E4%B8%AD%E6%9C%89%E5%A6%82%E4%B8%8B%E8%AF%AD%E5%8F%A5%EF%BC%9A.imminbox+%7B+width%3A39px%3B+height%3A29px%3Bpadding-right%3A3px%3B+cursor%3Apointer%3B+position%3Aabsolute+%3Bright%3A1px%3B+bottom%3A0px%3Bz-index%3A20%3B+overflow%3Avisible%3B+background%3Aurl%28..%2Fimages%2Fim_mi)
CSS中class和id的区别例如:CSSBBS新手教程第一课div{ width:100px; height:100px; border:1px solid #000; float:left; background:#99FF00; margin-left:10px;}.css{ background:#FFFF00}#css{ background:#00FFFF}直接div.css#css我修改运行
css中background和_background属性的区别css样式表中有如下语句:.imminbox { width:39px; height:29px;padding-right:3px; cursor:pointer; position:absolute ;right:1px; bottom:0px;z-index:20; overflow:visible; background:url(../images/im_mi
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background.