利用小数解析差异解决浏览器兼容性问题_html/css_WEB-ITnose
通常我们写 css 的时候写的数字都是整数，如 font-size:12px; margin:20px;那么看到标题可能有人会问，css 属性值可以有小数点么？如果是小数那会显示成什么样子？和整数有什么区别？
首先我们先看个例子，通过例子来观察下小数在各个浏览器的差异。
Html：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"/> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/> <meta name="renderer" content="webkit"/> <meta name="keywords" content=""/> <meta name="description" content=""/> <title>小数点在各个浏览器中的差异</title> <link rel="stylesheet" href="css/main.css"/></head><body> <div class="demo"> <p class="font15-9">这段文字的大小是15.9像素。</p> <p class="font16">这段文字的大小是16像素。</p> <p class="font14-4">这段文字的大小是14.4像素。</p> <p class="font14">这段文字的大小是14像素。</p> </div></body></html>
Css：
@charset "utf-8";@import "core/config";@import "core/reset";.demo { margin:50px; font-family:SimSun; p { height:30px; margin:20px; } .font15-9 { font-size:15.9px; } .font16 { font-size:16px; } .font14-4 { font-size:14.4px; } .font14 { font-size:14px; }}结论：
我们可以看出在 chrome/firefox/ie8-11 下小数会通过四舍五入的方式转成整数，而 ie6/ie7 会对小数进行下限取整转成整数。通过这一特性我们在某些情况下，用小数来替代 css hack。譬如：
Html：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"/> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/> <meta name="renderer" content="webkit"/> <meta name="keywords" content=""/> <meta name="description" content=""/> <title>小数点在各个浏览器中的差异</title> <link rel="stylesheet" href="css/main.css"/></head><body> <div class="demo"> <div class="black"> <div class="red"></div> <p>在 ie6/ie7 下红色块离黑色块没有外边距，而其他的浏览器则有 1px 外边距。一般我们是写 css hack，如 margin:1px;*margin:0; 但是我们现在可以通过小数来解决啦。</p> </div> </div></body></html>
Css：
@charset "utf-8";@import "core/config";@import "core/reset";@import "core/common";.demo { margin:50px; font-size:30px; font-family:SimSun; .black { overflow:hidden; width:500px; height:500px; @include center-block; background-color:#000; color:#fff; } .red { width:100px; height:100px; margin:1.1px; background-color:#f00; }}不仅仅缩短的代码的长度，还去掉了 css hack。
总结：
虽说这个小数解决一些兼容性问题很神奇，但是它的缺点也很明显，就是适用范围，只能解决 相差 1 像素的浏览器差异， 而且只能解决 ie6/ie7 下 1 像素的差异。
测试浏览器：chrome/firefox/ie6-11
参考资料： 鲜为人知的一个解决兼容性问题的利器——小数
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