Just to be sure this is clear: you cannot put the script reference to jquery-ui before the jquery script itself. That's what fixed the problem to me: first jquery-x.x.x.min.js, then jquery-ui-xxxxxx.js.
把jquery.min.js放到前面就行了。
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Uncaught ReferenceError: $ is not defined? 的解決方法已經有3837次圍觀