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：
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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：http://www.w3.org/TR/CSS2/syndata.html#escaped-characters
所以上例可以改成：
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