我想獲取我的 vue.js 項(xiàng)目的屏幕截圖。因此我將它用于 html2canvas。我使用以下步驟來(lái)應(yīng)用 html2canvas。第 1 步-：將“html2canvas”安裝到我的項(xiàng)目中npm install html2canvas步驟2-：在我的項(xiàng)目代碼中導(dǎo)入html2 canvas。項(xiàng)目代碼-：<template>  <div class="hello">    <div id="photo">      <p>This is vue screenshor</p>    </div>    <button v-on:click="screenshot">Take Picture</button>  </div></template><script>//import html2canvas from 'vue-html2canvas';import html2canvas from 'html2canvas';export default {  name: 'HelloWorld',  data () {    return {      msg: 'Welcome to Your Vue.js App'    }  },  methods:{    screenshot(){      console.log('Function Screenshot');    html2canvas(document.getElementById('photo')).then(canvas => {      document.body.appendChild(canvas)    });    }  }}</script>但我正在運(yùn)行這個(gè)項(xiàng)目，它給出以下錯(cuò)誤 -：ReferenceError: html2canvas is not defined我如何解決這個(gè)問題？