此jquery select语句中的第二个参数是什么? [英] What is the second argument in this jquery select statement?

问题描述

我在此处看到了它.以下语句中的tbl是什么意思?这意味着什么?

I have seen it here. What is meant by tbl in the following statement? What does it imply?

var rows = $('tr', tbl);

推荐答案

上面的tbl是另一个dom元素.这作为(可选参数)context传递:

The tbl in the above is another dom element. This is passed in as the (optional parameter) context:

jQuery( selector [, context ] )

...对于selector，在这种情况下为'tr'.

...for the selector, in this case 'tr'.

基本上就是这样:

$('tr', tbl);

说返回与元素tbl 中的选择器'tr'匹配的所有内容.

给定

<table>
  <tr>first</tr>
<table>
<table id="test">
   <tr>second</tr>
</table>

这将返回不同的结果:

//context is global
$('tr') => first & second

//restrict the context to just the second table 
//by finding it and passing it into the selector
var tbl = $('#test');
$('tr', tbl) => just second

这篇关于此jquery select语句中的第二个参数是什么?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！