html2canvas 下载

思路：

        1.安装html2canvas

        2.引入html2canvas

        3.使用html2canvas把html转成canvas

        4.使用canvas.toDataURL得到base64

        5.base64赋值给a标签的url

        6.为a标签设置downlaod

        7.模拟点击a标签，执行下载

npm i html2canvas

import html2canvas from "html2canvas";

html2canvas(document.querySelector("#id")).then((canvas) => {
    var url = canvas.toDataURL();
    let a = document.createElement('a')
    a.href = url
    a.download = '海报.png';
    a.click()
    a=null
});