Uncaught Error:Bootstrap's JavaScript requires jQuery

Error description¶

Uncaught Error: Bootstrap's JavaScript requires jQuery version 1.9.1 or higher, but lower than version 4

Reason Analysis¶

Solution¶

method 1¶

When introducing the js file, the version I introduced was 1.8.3, which is too low, just change to a higher version.
Such as:

method 2¶

Before introducing bootstrap, you need to introduce jquery. Because bootstrap depends on jquery.