如表1中第三列所示，几乎所有这些方法都带有一个作为可选参数的CSS3选择器。
As shown in the third column of Table 1, almost all of these methods take a CSS3 selector as an optional parameter.
主键列由其行选择器中的主键符号标识。
A primary key column is identified by a primary key symbol in its row selector.
如果该资料行位于资料表的主索引键，资料列选择器将显示索引键符号。
The row selector displays a key symbol if the column is in the table's primary key.
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