CSS学习：关于background-position_css

在Rainer’s css手册里对background-position这样写道:

默认值为： 0% 0% 。此时背景图片将被定位于对象不包括补丁( padding )的内容区域的左上角。
如果只指定了一个值，该值将用于横坐标。纵坐标将默认为 50% 。如果指定了两个值，第二个值将用于纵坐标。
如果设置值为 right center ，因为 right 作为横坐标值将会覆盖 center 值，所以背景图片将被居右定位。

其实并不全是这样的,它的2个值根是据语意自动判断的
比如 background-position:left top; 和 background-position:top left ;的显示效果是一样的.top作用于y坐标使背景图片上对齐,left使背景图片左对齐.

运行代码框

<style type=”text/<a href="https://www.gaodaima.com/tag/css" title="查看更多关于css的文章" target="_blank">css</a>“>body { background-image:url(<a href="http://www.webjx.com/images/logo.gif" rel="box" class="fancybox" title="CSS学习：关于background-position_css" rel="nofollow">http://www.webjx.com/images/logo.gif</a>); background-position:left top; background-repeat:no-repeat;}</style>[/code]</p> <p><input style="CURSOR: hand" onfocus=this.blur() type=button value=运行代码>  <input style="WIDTH: 95px; CURSOR: hand" onfocus=this.blur() onclick=cycode(code) type=button value=复制到剪贴板 name=Submit>  <input style="CURSOR: hand" onfocus=this.blur() onclick=svcode(code) type=button value=另存代码> [Ctrl+A 全部选择 提示：你可先修改部分代码，再按运行] </p> <p></SPAN><span>运行代码框<br /><span></P></p> <p align=center><textarea rows=12 cols=78><style type=”text/css”>body { background-image:url(<a href="http://www.webjx.com/images/logo.gif" rel="box" class="fancybox" title="CSS学习：关于background-position_css" rel="nofollow">http://www.webjx.com/images/logo.gif</a>); background-position:left top; background-repeat:no-repeat;}</style>[/code]</p> <p><input style="CURSOR: hand" onfocus=this.blur() type=button value=运行代码>  <input style="WIDTH: 95px; CURSOR: hand" onfocus=this.blur() onclick=cycode(code1) type=button value=复制到剪贴板 name=Submit>  <input style="CURSOR: hand" onfocus=this.blur() onclick=svcode(code1) type=button value=另存代码> [Ctrl+A 全部选择 提示：你可先修改部分代码，再按运行]</span></span></P></p> <p><span><span>如果指定了background-position:100px left;由于left已经作用于x坐标,100px则作用于y坐标,它和background-position:left 100px效果一致.</span></span></p> <p><span><span>运行代码框<br /></span></span></p> <p><span><span><span></p> <p align=center><textarea rows=12 cols=78><style type=”text/css”>body { background-image:url(<a href="http://www.webjx.com/images/logo.gif" rel="box" class="fancybox" title="CSS学习：关于background-position_css" rel="nofollow">http://www.webjx.com/images/logo.gif</a>); background-position:100px left; background-repeat:no-repeat;}</style>[/code]</p> <p><input style="CURSOR: hand" onfocus=this.blur() type=button value=运行代码>  <input style="WIDTH: 95px; CURSOR: hand" onfocus=this.blur() onclick=cycode(code2) type=button value=复制到剪贴板 name=Submit>  <input style="CURSOR: hand" onfocus=this.blur() onclick=svcode(code2) type=button value=另存代码> [Ctrl+A 全部选择 提示：你可先修改部分代码，再按运行]</p> <p>运行代码框<br /><span></p> <p align=center><textarea rows=12 cols=78><style type=”text/css”>body { background-image:url(<a href="http://www.webjx.com/images/logo.gif" rel="box" class="fancybox" title="CSS学习：关于background-position_css" rel="nofollow">http://www.webjx.com/images/logo.gif</a>); background-position:left 100px; background-repeat:no-repeat;}</style>[/code]</p> <p><input style="CURSOR: hand" onfocus=this.blur() type=button value=运行代码>  <input style="WIDTH: 95px; CURSOR: hand" onfocus=this.blur() onclick=cycode(code3) type=button value=复制到剪贴板 name=Submit>  <input style="CURSOR: hand" onfocus=this.blur() onclick=svcode(code3) type=button value=另存代码> [Ctrl+A 全部选择 提示：你可先修改部分代码，再按运行] </span></span></span></SPAN></P> </p> <p>欢迎大家阅读<span style='color:red;'>《CSS学习：关于background-position_css》</span>,跪求各位点评,若觉得好的话请收藏本文，by <strong>搞代码</strong></p> <hr /><div class="open-message">搞代码网（<a href="www.gaodaima.com" target="_blank" title="gaodaima.com">gaodaima.com</a>）提供的所有资源部分来自互联网，如果有侵犯您的版权或其他权益，请说明详细缘由并提供版权或权益证明然后发送到邮箱<a>chengxuyuan@gaodaima.com‍</a>，我们会在看到邮件的第一时间内为您处理，或直接联系<a>QQ：872152909</a>。本网站采用<a href="https://www.gaodaima.com/go.html?url=http://creativecommons.org/licenses/by-nc-sa/3.0/" rel="nofollow" target="_blank" title="BY-NC-SA授权协议">BY-NC-SA</a>协议进行授权 <br >转载请注明原文链接：<a href="https://www.gaodaima.com/22283.html" target="_blank" title="CSS学习：关于background-position_css">CSS学习：关于background-position_css</a><a id="spreadAds" target="_blank" href="" onclick="spreadAds()"></a><a id="spreadAds2" target="_blank" href=""></a> </div> </p> <div class="article-social"> <a href="javascript:;" 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