.first,#second span{color:green;}理解不懂?求大神指点
.first,#second span{color:green;}相当于.first span{color:green;}、#second span{color:green;}
还是.first{color:green;}、#second span{color:green;}
.first,#second span{color:green;}相当于.first span{color:green;}、#second span{color:green;}
还是.first{color:green;}、#second span{color:green;}
2015-05-09
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