You can refer to Figure 2 to quickly check the CSS syntax for HTML, ID, and class selectors.

可以参考图2，了解HTML、ID和类选择符的css语法。

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In this example, the function is passed a string containing some Cascading Style Sheets (CSS) syntax, and jQuery finds the elements as efficiently as possible.

在本例中，一个包含有一些层叠样式表(Cascading Style Sheet, CSS)语法的字符串被传递给函数，然后jQuery尽可能高效地把这些元素找出来。

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