Vue.use(plugin) causing error: Vue is a constructor and should be called with the `new` keywor

Question

涉及插件 - https://www.npmjs.com/package/sweetalert

main.js

中的代码

import 'bootstrap/dist/css/bootstrap.min.css';
import 'bootstrap-vue/dist/bootstrap-vue.css';
import BootstrapVue from 'bootstrap-vue';

import Vue from 'vue';
import Vuetify from 'vuetify';
import swal from 'sweetalert';
import App from './App';
import router from './router';

Vue.use(BootstrapVue);
Vue.use(Vuetify);
Vue.use(swal);

浏览器收到错误：

Uncaught SweetAlert: 1st argument ('function Vue (options) {
if ("development" !== 'production' &&
!(this instanceof Vue)
) {
warn('Vue is a constructor and should be called with the new
keyword');
}
this._init(options);
}') is invalid

Answer 1

如评论中所述，sweetalert 模块（来自 https://www.npmjs.com/package/sweetalert) is not a Vue plugin，因此您不能在...

中使用它

Vue.use(swal)

您可以做的是创建一个插件。例如，这会将 swal() 函数作为全局方法 (Vue.swal()) 和实例方法 (this.$swal())

添加到 Vue

import Vue from 'vue'
import swal from 'sweetalert'

Vue.use({
  // this is the required "install" method for Vue plugins
  install (Vue) {
    Vue.swal = swal
    Vue.prototype.$swal = swal
  }
})

我强烈建议使用现有的 Vue 插件，例如 vue-sweetalert2。

Vue.use(plugin) causing error: Vue is a constructor and should be called with the `new` keywor

Vue.use(plugin) causing error: Vue is a constructor and should be called with the `new` keywor

javascript

vuejs2

sweetalert2