用逗号分隔的选择器列表? [英] Comma separated list of selectors?

问题描述

此刻我正在重构一些代码，并且遇到了一个选择器:

I'm refactoring some code at the moment and have come across a selector:

jQuery("tr","#ctl00_MainContent_MyUserControl").each(function(i,row) { ... }

看起来它是从页面上的用户控件中选择<tr>的(忽略实例完全命名的事实！)，但这不是我熟悉的语法，因此无法在其中找到任何内容文档.我希望它会写成:

It looks like it's selecting <tr>'s from the user control on the page (ignore the fact that the instance is fully named!) but it's not a syntax I'm familiar with and can't find anything in the documentation. I'd expect it to be written:

$("#ctl00_MainContent_MyUserControl tr").each(function(i,row) { ... }

有人可以告诉我我在这里是否有所不同(微妙或其他)?

Can anyone tell me if there's a difference (subtle or otherwise) that I'm missing here??

推荐答案

此选择器选择所有ctl00_MainContent_MyUserControl的元素内的c1>元素.它与您的第二个示例完全相同.

This selector selects all tr elements inside an element with id ctl00_MainContent_MyUserControl. It is exactly the same as your second example.

第二个参数为第一个参数提供上下文.此语法有更好的用例，例如:

The second parameter provides a context for the first parameter. There are better use cases for this syntax, for example:

function(el) {
    $('tr', el).each(...);
}

el是页面上的某些元素.在这种情况下，您不能使用第二种语法形式.

Where el is some element on your page. In this case, you can't use the second syntax form.

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