我有一个简单的jquery点击事件
<script type="text/javascript">
$(function() {
$('#post').click(function() {
alert("test");
});
});
</script>
以及在site.master中定义的jquery引用
<script src="<%=ResolveUrl("~/Scripts/jquery-1.3.2.js")%>" type="text/javascript"></script>
我已经检查了脚本被正确解析，我能够看到标记，并直接在firebug中查看脚本，所以我必须被发现。然而，我仍然得到:
$没有定义
jquery没有一个是有效的。我还尝试了它的各种变体，比如$(document)。ready和jQuery等。
这是一个。net 3.5上的MVC 2应用程序，我确信我真的很密集，谷歌上的所有地方都说要检查文件是否被正确引用，我已经检查了一遍又一遍，请建议!: /
当前回答
I had this problem once for no apparent reason. It was happenning locally whilst I was running through the aspnet development server. It had been working and I reverted everything to a state where it had previously been working and still it didn't work. I looked in the chrome debugger and the jquery-1.7.1.min.js had loaded without any problems. It was all very confusing. I still don't know what the problem was but closing the browser, closing the development server and then trying again sorted it out.
其他回答
如果jQuery插件调用在</body>旁边，并且你的脚本是在</body>之前加载的，你应该让你的代码在窗口后运行。Onload事件，像这样:
window.onload = function() {
//YOUR JQUERY CODE
}
`
因此，您的代码将只在窗口加载后运行，此时所有资产都已加载。此时，将定义jQuery($)。
如果你使用它:
$(document).ready(function () {
//YOUR JQUERY CODE
});
`
$现在还没有定义，因为它是在jQuery加载之前调用的，你的脚本在控制台的第一行就会失败。
我们有同样的问题....但是我不小心检查了文件夹属性并设置了一些东西…
你必须检查你正在访问的每个文件夹的属性。
右键单击文件夹 “权限”选项卡 设置文件夹访问权限: OWNER:创建和删除文件 GROUP:访问文件 其他:访问文件
我希望这是解决方案......
这是解决这个问题的常见问题，你必须检查一些点
包含主要Jquery库 检查跨浏览器问题 添加库顶部的jquery代码 检查cdn可能被阻止。
详情请见本博客
I had this problem once for no apparent reason. It was happenning locally whilst I was running through the aspnet development server. It had been working and I reverted everything to a state where it had previously been working and still it didn't work. I looked in the chrome debugger and the jquery-1.7.1.min.js had loaded without any problems. It was all very confusing. I still don't know what the problem was but closing the browser, closing the development server and then trying again sorted it out.
我有同样的问题，并解决了它使用
document.addEventListener('DOMContentLoaded', () => {
// code here
});
