主要论述层的基本知识，介绍了层的用法，并在最后给出用层来解决一个考试系统的浮动层的实现方法。
The article main elaboration level elementary knowledge, introduced the level usage, and finally is given a fluctuation layer realization method to solve an online test system.
主要论述层的基本知识，介绍了层的用法，并在最后给出用层来解决一个考试系统的浮动层的实现方法。
The article main elaboration level elementary knowledge, introduced the level usage, and finally is given a fluctuation layer realization method to solve an online test system.
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