CSS非ASCII字符最佳实践

  作者：zhanhailiang 日期：2014-10-30

问题场景

在写样式时经常需要用到非ASCII字符的属性值，如下：

.hot_list .sign_discount:before { 
   content: "满减"; 
   padding: 0 8px; 
   margin-right: 7px; 
   font-size: 12px; 
   line-height: 14px; 
   color: #fff; 
   text-align: center; 
   background-color: #f13993; 
   border-radius: 11px;
}

但是Chrome下展示时有些时候会显示乱码：

除content外，font字体也是经常需要用于非ASCII字符的值，如font-family: “微软雅黑”

最佳实践

为避免以上这类编码问题，CSS推荐在涉及非ASCII字符时统一使用反斜杠转义以避免编码问题：

backslash escapes allow authors to refer to characters they cannot easily put in a document. In this case, the backslash is followed by at most six hexadecimal digits (0..9A..F), which stand for the ISO 10646 ([ISO10646]) character with that number, which must not be zero. (It is undefined in CSS 2.1 what happens if a style sheet does contain a character with Unicode codepoint zero.) If a character in the range [0-9a-fA-F] follows the hexadecimal number, the end of the number needs to be made clear.

详情请见：https://www.w3.org/TR/CSS2/syndata.html#escaped-characters

所以上例可以改成：

.hot_list .sign_discount:before { 
   content: "\6ee1\51cf"; 
   padding: 0 8px; 
   margin-right: 7px; 
   font-size: 12px; 
   line-height: 14px; 
   color: #fff; 
   text-align: center; 
   background-color: #f13993; 
   border-radius: 11px;
}