使用 jQuery 在每一行中选择第一个 TD
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Select first TD in every row w/ jQuery
提问by santa
How do I assign a style to every first cell of every row in a table?
如何为表格中每一行的每个第一个单元格分配样式？
$("#myTable tr td:first").addClass("black");
回答by Devin Burke
Use the :first-childpseudo class instead of :first.
使用:first-child伪类而不是:first.
$("#myTable tr td:first-child").addClass("black");
The :firstpseudo class actually selects the first element that was returned in your list. For example, $('div span:first')would return onlythe very first span under the first div that happened to be returned.
该:first伪类实际上将会选择在您的列表中返回的第一个元素。例如，$('div span:first')将仅返回碰巧返回的第一个 div 下的第一个跨度。
The :first-childpseudo class selects the first element under a particular parent, but returns as many elements as there are first children. For example, $('table tr td:first-child')returns the first cell of every single row.
的:first-child伪类选择一特定父下的第一个元素，但返回一样多的元素有第一孩子。例如，$('table tr td:first-child')返回每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.
当您使用 时:first，它只返回碰巧被选中的第一行的第一个单元格。
For more information, consult the jQuery documentation:
有关更多信息，请参阅 jQuery 文档：
回答by nathan gonzalez
you were pretty close, i think all you need is :first-childinstead of :first, so something like this:
你非常接近，我认为你需要的只是:first-child而不是:first，所以是这样的：
$("#myTable tr td:first-child").addClass("black");
回答by bevacqua
$("#myTable tr").find("td:first").addClass("black");
回答by Teneff
like this:
像这样：
$("#myTable tr").each(function(){
$(this).find('td:eq(0)').addClass("black");
});
回答by stefgosselin
Try:
尝试：
$("#myTable td:first-child").addClass("black");
