[英]jQuery variable undefined when storing number from .attr('href')
I'm trying to get the number from this link 我正在尝试从此链接获取号码
<div id="section-tabs-header">
<a id="section-tabs-header-subtitle" class="ellipsis" href="/courses/123456">Math 101</a>
and store it in a variable 并将其存储在变量中
var courseID = $("div#section-tabs-header a#section-tabs-header-subtitle").attr("href").match(/\d+/);
console.log(courseID);
but the variable is "undefined." 但是变量是“未定义”。
http://jsbin.com/ukogam/2/edit http://jsbin.com/ukogam/2/edit
Is it because what jQuery is finding is html rather than the plain text of the number? 是否因为jQuery找到的是html而不是数字的纯文本? How do I get just the number?
我如何获得电话号码?
I didn't see anything about the variable being undefined. 我没有看到有关变量未定义的任何信息。 I got that $ was undefined so I included jQuery.
我知道$是未定义的,所以我包含了jQuery。 Then I got that href wasn't a function so I modified some code that was after the code you mentioned to this:
$("#main a").attr("href","/courses/" + courseID);
然后我得到href不是函数,所以我修改了您提到的代码之后的一些代码:
$("#main a").attr("href","/courses/" + courseID);
I think this is working how you expect? 我认为这对您的期望有效吗? http://jsbin.com/egevok/1/edit
http://jsbin.com/egevok/1/edit
I modified it, have a look http://jsbin.com/iculoq/2/edit . 我修改了它,看看http://jsbin.com/iculoq/2/edit 。
var courseID = $("#section-tabs-header-subtitle").attr("href").split('/')[2];
$("#main a").attr('href', "/courses/" + courseID);
var href = $("#section-tabs-header-subtitle")
.attr("href");
console.log(href);
var courseID = href.match(/\d+/);
console.log(courseID);
$("#main a").attr("href","/courses/" + courseID);
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