Html2canvas文档地址

1. npm安装Html2canvas

npm install --save html2canvas

2. 项目文件引入Html2canvas（在哪使用就引入到哪）

import html2canvas from 'html2canvas'

3. 使用（最后可生成png图片）

<template>
	<Button
        class="ml-3"
        type="primary"
        icon="ios-cut"
        @click="saveImage('dataDiv', '截图')"
      >
        截屏
      </Button>
      <div ref="dataDiv" class="data-warp">
      	// 被截图区域,需要在div上设置ref
      </div>
</template>
<script>
import html2canvas from 'html2canvas'
export default {
	methods: {
      //图片格式转换方法
      dataURLToBlob(dataurl) {
        let arr = dataurl.split(',')
        let mime = arr[0].match(/:(.*?);/)[1]
        let bstr = atob(arr[1])
        let n = bstr.length
        let u8arr = new Uint8Array(n)
        while (n--) {
          u8arr[n] = bstr.charCodeAt(n)
        }
        return new Blob([u8arr], { type: mime })
      },
      //点击方法
      saveImage(divText, imgText) {
        let canvasID = this.$refs[divText]
        let that = this
        let a = document.createElement('a')
        html2canvas(canvasID).then((canvas) => {
          let dom = document.body.appendChild(canvas)
          dom.style.display = 'none'
          a.style.display = 'none'
          document.body.removeChild(dom)
          let blob = that.dataURLToBlob(dom.toDataURL('image/png'))
          a.setAttribute('href', URL.createObjectURL(blob))
          //这块是保存图片操作  可以设置保存的图片的信息
          a.setAttribute('download', imgText + '.png')
          document.body.appendChild(a)
          a.click()
          URL.revokeObjectURL(blob)
          document.body.removeChild(a)
        })
      },
   }
}
</script>