基于Vue实现html2canvas实现一键截图

1. 下载依赖

npm install html2canvas --save

2. 完整代码

<template>
  <div class="home">
    <div class="inv_box" ref="imageTofile">
      QQQQQQQQQQ
    div>
    <el-button @click="screenshot" >截图el-button>
  div>
template>
<script>
import html2canvas from 'html2canvas';

export default {
  name: "home",
  data() {
    return {
      ezvizPlay: null,
    };
  },
  components: {},
  props: {},
  watch: {},
  computed: {},
  mounted() {},
  methods: {
    // 截图
    screenshot(){
      // 手动创建一个 canvas 标签
      const canvas = document.createElement("canvas")
      // 获取父标签，意思是这个标签内的 DOM 元素生成图片
      // video是给截图范围内的父级元素自定义的ref名称
      let canvasBox = this.$refs.video
      // 获取父级的宽高
      const width = parseInt(window.getComputedStyle(canvasBox).width)
      const height = parseInt(window.getComputedStyle(canvasBox).height)
      // 宽高 * 2 并放大 2 倍 是为了防止图片模糊
      canvas.width = width * 2
      canvas.height = height * 2
      canvas.style.width = width + 'px'
      canvas.style.height = height + 'px'
      const context = canvas.getContext("2d");
      context.scale(2, 2);
      const options = {
        backgroundColor: null,
        canvas: canvas,
        useCORS: true
      }
      html2canvas(canvasBox, options).then((canvas) => {
        // toDataURL 图片格式转成 base64
        let dataURL = canvas.toDataURL("image/png")
        this.downloadImage(dataURL,'baocun')
      })
    },
    downloadImage(url,name) {
      // 如果是在网页中可以直接创建一个 a 标签直接下载 
      let a = document.createElement('a')
      a.href = url
      a.download = name
      a.click()
    },
  }
};
script>
<style lang="scss" scoped>
style>

3. 效果图