axios中的then接受不到数据 报错unknow

前端页面使用axios接受数据时报出unknow

浏览器开发者工具控制台报如下错

下面是books.html

="utf-8">

="X-UA-Compatible" content="IE=edge">



="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no" name="viewport">



="stylesheet" href="../plugins/elementui/index.css">

="stylesheet" href="../plugins/font-awesome/css/font-awesome.min.css">

="stylesheet" href="../css/style.css">

<div id="app">

    <div class="content-header">

        <h1>图书管理h1>

    div>

    <div class="app-container">

        <div class="box">

            <div class="filter-container">

                <el-input placeholder="图书名称" v-model="pagination.queryString" style="width: 200px;" class="filter-item">el-input>

                <el-button @click="getAll()" class="dalfBut">查询el-button>

                <el-button type="primary" class="butT" @click="handleCreate()">新建el-button>

            div>

            <el-table size="small" current-row-key="id" :data="dataList" stripe highlight-current-row>

                <el-table-column type="index" align="center" label="序号">el-table-column>

                <el-table-column prop="type" label="图书类别" align="center">el-table-column>

                <el-table-column prop="name" label="图书名称" align="center">el-table-column>

                <el-table-column prop="description" label="描述" align="center">el-table-column>

                <el-table-column label="操作" align="center">

                    <template slot-scope="scope">

                        <el-button type="primary" size="mini" @click="handleUpdate(scope.row)">编辑el-button>

                        <el-button type="danger" size="mini" @click="handleDelete(scope.row)">删除el-button>

                    template>

                el-table-column>

            el-table>

            

            <div class="add-form">

                <el-dialog title="新增图书" :visible.sync="dialogFormVisible">

                    <el-form ref="dataAddForm" :model="formData" :rules="rules" label-position="right" label-width="100px">

                        <el-row>

                            <el-col :span="12">

                                <el-form-item label="图书类别" prop="type">

                                    <el-input v-model="formData.type"/>

                                el-form-item>

                            el-col>

                            <el-col :span="12">

                                <el-form-item label="图书名称" prop="name">

                                    <el-input v-model="formData.name"/>

                                el-form-item>

                            el-col>

                        el-row>


                        <el-row>

                            <el-col :span="24">

                                <el-form-item label="描述">

                                    <el-input v-model="formData.description" type="textarea">el-input>

                                el-form-item>

                            el-col>

                        el-row>

                    el-form>

                    <div slot="footer" class="dialog-footer">

                        <el-button @click="dialogFormVisible = false">取消el-button>

                        <el-button type="primary" @click="handleAdd()">确定el-button>

                    div>

                el-dialog>

            div>

            

            <div class="add-form">

                <el-dialog title="编辑检查项" :visible.sync="dialogFormVisible4Edit">

                    <el-form ref="dataEditForm" :model="formData" :rules="rules" label-position="right" label-width="100px">

                        <el-row>

                            <el-col :span="12">

                                <el-form-item label="图书类别" prop="type">

                                    <el-input v-model="formData.type"/>

                                el-form-item>

                            el-col>

                            <el-col :span="12">

                                <el-form-item label="图书名称" prop="name">

                                    <el-input v-model="formData.name"/>

                                el-form-item>

                            el-col>

                        el-row>

                        <el-row>

                            <el-col :span="24">

                                <el-form-item label="描述">

                                    <el-input v-model="formData.description" type="textarea">el-input>

                                el-form-item>

                            el-col>

                        el-row>

                    el-form>

                    <div slot="footer" class="dialog-footer">

                        <el-button @click="dialogFormVisible4Edit = false">取消el-button>

                        <el-button type="primary" @click="handleEdit()">确定el-button>

                    div>

                el-dialog>

            div>

        div>

    div>

div>

后台控制台没有显示报错

一开始我以为是index.js文件里面的代码格式问题，回来网上找个格式分明一点的，但还是报错

然后我发现浏览器开发者工具中有一个js的代码只显示了个数字1

下面是项目源码链接，包含数据库 数据库名为：db1

链接：https://pan.baidu.com/s/1b4ShKGYlzQYjmUWFvbTLDQ?pwd=1234
提取码：1234

仔细看请求地址不对，后台启动后服务地址是8080/ssm 在实际请求的时候变成了book。把ssm漏了