bootstrapVue模态框不显示问题

bootstrap模态框不显示问题
点击按钮有反应但是不显示弹出内容

img

<template>
<div>
  <h2 class="dome">图书馆管理系统h2>
  <div>
    <b-nav pills  style="background-color:#545c64">
      <b-nav-item href="/HomePage">系统首页b-nav-item>
      <b-nav-item href="/HelloWorld">图书管理b-nav-item>
      <b-nav-item>读者管理b-nav-item>
      <b-nav-item>借归管理b-nav-item>
      <b-nav-item>信息查询b-nav-item>
    b-nav>
  div>
  <div>
    <b-button v-b-modal.my-modal>新增读者b-button>
      <b-modal id="my-modal" title="新增读者">
        <b-form-input v-model="form.rid" type="text"  placeholder="请输入条码号">b-form-input> 
      b-modal>  
  div>
  <div>
    <b-table-lite  hover :items="items" :fields="fields">b-table-lite>
  



<script>
export default {
    data() {
      return {
        fields:[
          {key:'rid',label:'条码号'},
          {key:'rname',label:'姓名'},
          {key:'rtype',label:'职业'},
          {key:'rcardtype',label:'证件'},
          {key:'rcardid',label:'身份证号'},
          {key:'rphone',label:'手机号'},
          {key:'remail',label:'电子邮箱'}
        ],
        items: [
            {
        rid: '202202220001',
        rname: '张三',
        rtype: '学生',
        rcardtype: '学生证',
        rcardid: '11111111111111',
        rphone: '1222222222',
        remail: '7xxxxxx@qq.com'

      },
      {
        rid: '202202220002',
        rname: '里斯',
        rtype: '学生',
        rcardtype: '学生证',
        rcardid: '11111111111111',
        rphone: '1222222222',
        remail: '7xxxxxx@qq.com'

      },
      {
        rid: '2022201',
        rname: '王二',
        rtype: '老师',
        rcardtype: '教师证',
        rcardid: '11111111111111',
        rphone: '1222222222',
        remail: '7xxxxxx@qq.com'

      },
      {
        rid: '20150501',
        rname: '高其',
        rtype: '校长',
        rcardtype: '教师证',
        rcardid: '11111111111111',
        rphone: '1222222222',
        remail: '7xxxxxx@qq.com'

      }
        ],
        form:[{rid:''}]
      }
    }
}
script>

<style>

style>

你可以参考下这篇文章:BootstrapVue使用入门