something is not right
(事情不对)
Well, you are using jQuery to check for the presence of jQuery.
(好吧，您正在使用jQuery检查jQuery是否存在。)
If jQuery isn't loaded then $() won't even run at all and your callback won't execute, unless you're using another library and that library happens to share the same $() syntax.(如果未加载jQuery，则$()甚至都不会运行，并且回调也不会执行，除非您使用的是另一个库，并且该库恰好共享相同的$()语法。)
Remove your $(document).ready() (use something like window.onload instead):
(删除您的$(document).ready() （改用window.onload东西）：)
window.onload = function() {
if (window.jQuery) {
// jQuery is loaded
alert("Yeah!");
} else {
// jQuery is not loaded
alert("Doesn't Work");
}
}
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