Episode 52 “Carrier Classes & Discussing Syntax” [AtA]

关于Hadoop的使用镜像

In the last article, we introduced some basic concepts of object-oriented programming (OOP), and discussed an example where we used OOP principles to model professors and students in a school.

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At-rules are CSS statements that instruct CSS how to behave. They begin with an at-sign, @ (U+0040 COMMERCIAL AT), followed by an identifier. They include everything from the at-keyword up to the next semicolon, ; (U+003B SEMICOLON), or the next CSS block, whichever comes first.

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