vue引入jquery报错 jQuery is not defined

vue引入jquery报错 jQuery is not defined

ReferenceError: jQuery is not define

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解决方法：

创建一个js文件 — vue.config.js

vue.config.js

  const webpack = require("webpack");

  module.exports = {
      configureWebpack: {
          plugins: [
              new webpack.ProvidePlugin({
                  $: "jquery",
                  jQuery: "jquery",
                  "window.jQuery": "jquery",
                  "window.$": "jquery",
                  Popper: ["popper.js", "default"]
              })
          ]
      }
  };