javascript 对于具有特定类功能的每个表格行/单元格
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For each table row / cell with specific class function
提问by blasteralfred Ψ
I have a table. The table has some set of rows, each set containing 3 specific rows, and repeated downwards.
我有一张桌子。该表有一组行，每组包含 3 个特定的行，并向下重复。
I want to have a variable iwhich should be incremented for each row (<tr>) having class="nm"or for each cell (<td>) having class="zxcv". The incremented result value imay be alerted finally.
我想要一个变量i，它应该为每行 ( <tr>)class="nm"或每个单元格 ( <td>) 增加class="zxcv"。增加的结果值i可以最终被提醒。
How can I do this using JavaScript with / without jQuery?
我如何使用带有/不带有 jQuery 的 JavaScript 来做到这一点？
You can see my JS Fiddle here.
你可以在这里看到我的 JS Fiddle。
回答by FishBasketGordo
If you just want to get a count of <tr class="nm">and <td class="zxcv">, using jQuery, do this:
如果您只想使用 jQuery获取<tr class="nm">and的计数<td class="zxcv">，请执行以下操作：
alert($('tr.nm, td.zxcv').length);
EDIT:
编辑：
To loop through each element, do this:
要遍历每个元素，请执行以下操作：
$('tr.nm, td.zxcv').each(function(index, elem) { /* do something */ });
回答by hughes
I find your wording a bit unclear, but if you're trying to do something to each row with the class "nm" you could use the .each()function:
我发现你的措辞有点不清楚，但如果你想用“nm”类对每一行做一些事情，你可以使用这个.each()函数：
$('.nm').each(function(i,row) {
//$(row) is now your .nm row
alert(i);
});
