问题描述
如何为表格中每行的每个第一个单元格分配样式?
How do I assign a style to every first cell of every row in a table?
$("#myTable tr td:first").addClass("black");
推荐答案
使用:first-child伪类代替:first.
$("#myTable tr td:first-child").addClass("black");
:first伪类实际上选择了列表中返回的第一个元素.例如，$('div span:first')只会在碰巧返回的第一个div下仅返回仅.
The :first pseudo class actually selects the first element that was returned in your list. For example, $('div span:first') would return only the very first span under the first div that happened to be returned.
:first-child伪类选择特定父级下的第一个元素，但返回的数量与第一个子级一样多.例如，$('table tr td:first-child')返回每行的第一个单元格.
The :first-child pseudo class selects the first element under a particular parent, but returns as many elements as there are first children. For example, $('table tr td:first-child') returns the first cell of every single row.
使用:first时，它仅返回碰巧被选中的第一行的第一个单元格.
When you used :first, it was returning only the first cell of the first row that happened to be selected.
有关更多信息，请查阅jQuery文档:
For more information, consult the jQuery documentation:
- http://api.jquery.com/first-selector/
- http://api.jquery.com/first-child-selector/
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