我在我的 laravel 应用程序中使用 vuetify 框架构建了一个简单的表单。 bootstrap.js 已经包含了 axios 客户端，但提交时仍然出现错误，提示 axios 未定义：

[Vue warn]: Error in event handler for "click": "ReferenceError: axios is not defined"

这是新 laravel 安装附带的默认 bootstrap.js 文件，我刚刚删除了 jquery：

window._ = require('lodash');
window.Popper = require('popper.js').default;

window.axios = require('axios');

window.axios.defaults.headers.common['X-Requested-With'] = 'XMLHttpRequest';

let token = document.head.querySelector('meta[name="csrf-token"]');

if (token) {
    window.axios.defaults.headers.common['X-CSRF-TOKEN'] = token.content;
} else {
    console.error('CSRF token not found: https://laravel.com/docs/csrf#csrf-x-csrf-token');
}

这就是我的 app.js 文件的样子：

import bootstrap from 'bootstrap';

import 'material-design-icons-iconfont/dist/material-design-icons.css' // Ensure you are using css-loader

import Vue from 'vue';
import Vuetify from 'vuetify';
import 'vuetify/dist/vuetify.min.css';

Vue.use(Vuetify);

Vue.component('form-component', require('./components/FormComponent.vue'));

const app = new Vue({
    el: '#app',

    data: {
        loading: true
    },

});

FormComponent 看起来像这样，基本上我正在尝试使用 axios 发布数据：

<template>
    <v-container grid-list-xl>
        <v-flex>
            <v-text-field
                v-model="name"
                :error-messages="nameErrors"
                :counter="10"
                label="Name"
                required
                @input="$v.name.$touch()"
                @blur="$v.name.$touch()"
            ></v-text-field>
        </v-flex>
        <v-flex>
            <v-btn @click="submit">submit</v-btn>
            <v-btn @click="clear">clear</v-btn>        
        </v-flex>
    </v-container>
</template>

<script>
import { validationMixin } from 'vuelidate'
import { required, maxLength, email } from 'vuelidate/lib/validators'

export default {
    mixins: [validationMixin],

    validations: {
        name: { required, maxLength: maxLength(20) }
    },

    data() {
        return {
            reactive: false,
            name: '',
        }
    },

    computed: {
        nameErrors () {
            const errors = [];
            if (!this.$v.name.$dirty) {
                return errors;
            } 
            !this.$v.name.maxLength && errors.push('Name must be at most 10 characters long');
            !this.$v.name.required && errors.push('Name is required.');
            return errors;
        },
    },

    methods: {
        submit () {
            this.$v.$touch(); 
            axios.post('event/store', {
                'name': this.name,
            })
            .then((response) => {
                console.log("success");
            })
            .catch((error) => {
                console.log("error");
            })
        },
        clear () {
            this.$v.$reset();
            this.name = '';
        }
    }

}
</script>

我正在加载 axios，所以我不知道为什么会出现这个错误。