Selecting elements by a tag name is useful, but what if you only want to select a subset of elements, based on their CSS class?
根据标记名选取元素非常有用，但如果只是想根据css类选择一个元素子集，该怎么办呢？
Selecting elements by a tag name is useful, but what if you only want to select a subset of elements, based on their CSS class?
根据标记名选取元素非常有用，但如果只是想根据css类选择一个元素子集，该怎么办呢？
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