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.first,#second span{color:green;} #是什么 为什么first不用加#,而second加

.first,#second span{color:green;} #是什么 为什么first不用加#,而second加

yss1122 2018-07-26 16:35:08
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慕瓜9220888

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反对 回复 2021-10-19
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Imunique

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id选择器是加#,类选择器加.

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反对 回复 2018-07-26
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