Cannot read property of 'fn' of undefined?

问题

Getting these error codes on my github pages. I have these as my order of loading scripts:

<script src="../../node_modules/jquery/dist/jquery.js"></script>
<script src="../../js/bootstrap.min.js"></script>
<script src="../../js/index.js"></script>

Here are the error messages:

GET https://tmolano.github.io/CareerMod4/node_modules/jquery/dist/jquery.js 404 ()
index.html:115 GET https://tmolano.github.io/CareerMod4/node_modules/popper.js/dist/popper.min.js 404 ()
util.js:56 Uncaught TypeError: Cannot read property 'fn' of undefined
    at util.js:56
    at util.js:10
    at bootstrap.min.js:6
    at bootstrap.min.js:6
(anonymous) @ util.js:56
(anonymous) @ util.js:10
(anonymous) @ bootstrap.min.js:6
(anonymous) @ bootstrap.min.js:6

Heres my page: https://tmolano.github.io/CareerMod4/

Other than the order of loading, what else could be causing this?

回答1:

Possible reasons for this error:

Uncaught TypeError: Cannot read property 'fn' of undefined

1. invalid reference to the file addresses or missing files (Your case).
2. Duplicate reference to the Jquery.
3. Overriding $ sign of Jquery in 3rd party libraries.
4. Using Jquery functions before inserting Jquery (Not your case).
5. Using deprecated syntax for load,error,unload on WINDOW element in jquery without on

来源：https://stackoverflow.com/questions/52451388/cannot-read-property-of-fn-of-undefined