jQuery Javascript 运行时错误：$ 未定义
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Javascript Runtime error: $ is undefined
提问by Ajay
I have added script in my Default.aspxpage. I am getting following error.
我在我的Default.aspx页面中添加了脚本。我收到以下错误。
回答by Marcelo Cantos
$is defined by jQuery, which you probably haven't referenced. A simple way to get it is to add one of the CDN urls to your template HTML:
$由 jQuery 定义，您可能没有引用。获取它的一种简单方法是将其中一个 CDN 网址添加到您的模板 HTML 中：
<script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>
回答by CodingIntrigue
You need to include jQuery: http://learn.jquery.com/about-jquery/how-jquery-works/
您需要包含 jQuery：http: //learn.jquery.com/about-jquery/how-jquery-works/
<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>Demo</title>
**<script src="jquery.js"></script>**
</head>
<body>
...
</body>
</html>
回答by taylorsabell
I had the same problem, but did have a correct reference to jQuery.
我遇到了同样的问题，但确实对 jQuery 有正确的引用。
I solved it by referencing jQuery beforeany other scripts. In your case, it would look like this:
我通过在任何其他脚本之前引用 jQuery 来解决它。在你的情况下，它看起来像这样：
<script src= "scripts/jquery-ui.js" />
<script src= "scripts/JavaScript_scroll.js" />
Hope this helps anyone else with a similar issue.
希望这可以帮助其他有类似问题的人。
回答by Abdul Khaliq
I had the Same Problem as that $ is Unidentified, After a long struggle, I come to know that there is some thing HTML coder error in Master Page, So it worked fine when i include the Jquery files directly in Content page
我遇到了与 $ 身份不明的相同问题，经过长时间的斗争，我知道母版页中存在一些 HTML 编码器错误， So it worked fine when i include the Jquery files directly in Content page
回答by mok
(For others who may face the same problem as OP's)
I had the same problem, but the reason was that I was trying to load my jQueryscript before loading the jQuerylibrary itself. In other words, make sure that you first add this line:
（对于可能面临与 OP 相同问题的其他人）
我遇到了同样的问题，但原因是我试图jQuery在加载jQuery库本身之前加载我的脚本。换句话说，请确保您首先添加以下行：
<script src="Scripts/jquery-{version}.min.js"></script>
before adding
添加前
<script src="Scripts/JavaSript_scroll.js"></script>
