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the problem is solved. This is what I wrote. I hope it will be helpful to the newcomers

.

        config.module
            .rule('expose1')
            .test(require.resolve('jquery'))
                .use()
                .loader('expose-loader')
                .options("jQuery")
                .end()
        config.module
            .rule('expose2')
            .test(require.resolve('jquery'))
                .use()
                .loader('expose-loader')
                .options("$")
                .end()

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https://codeshelper.com/a/11.

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check whether the jquery dependency name in package.json is correct, and confirm whether it is jQuery or jquery
webpack does not need to be changed, no problem

if it is jquery, then import 'jquery'

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this does not need to be configured. After install, just import in

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, the first article is too old. In the project generated by the new version of scaffolding, just define the dependency in package.json, install it, and then directly in .vue:

import $ from 'jquery'

In fact, what you need to consider later is whether to type in this dependency package. If you don't put it in externals
if it's my transformation, I suggest you not enter it. After all, it's not small, and to tell you the truth, it would be better to add a cdn address to script

.