1、安装html2canvas插件

npm install html2canvas --save

2、需要使用的页面引入html2canvas组件

import html2canvas from 'html2canvas'

3、主要实现代码

<div class="div-canvas" id="canvasPic">
    //里面放置你需要生成图片的内容
</div>


//方法
exportPic(){
        let self = this;
        event.preventDefault();
        let canvas2 = document.createElement("canvas");
        let _canvas = document.getElementById("canvasPic");
        let w = parseInt(window.getComputedStyle(_canvas).width);
        let h = parseInt(window.getComputedStyle(_canvas).height);
        //放大canvas画布，然后放在较小的容器内，像素会升高
        canvas2.width = w*2;
        canvas2.height = h*2;
        canvas2.style.width = w+"px";
        canvas2.style.height = h+"px";

        let context = canvas2.getContext("2d");
        context.scale(2,2);
        html2canvas(document.getElementById('canvasPic'),{
          canvas:canvas2
        }).then(function (canvas) {
          let fileName = "图片名字" + ".jpg"
          let imgUri = canvas.toDataURL("image/jpeg",2); // 获取生成的图片的url
          // console.log(imgUri)
          //下载方法
          self.fileDown(imgUri,fileName);
        });
      },
      fileDown(url, name) {
        let self = this
        let fileName = name
        self.axios({
          method: "post",
          url: url,
          responseType: "blob",
        }).then(data => {
          let blob = new Blob([data.data], { type: "application/json" });
          if (window.navigator.msSaveOrOpenBlob) {
            //msSaveOrOpenBlob方法返回bool值
            navigator.msSaveBlob(blob); //本地保存
          } else {
            let link = document.createElement("a"); //a标签下载
            link.href = window.URL.createObjectURL(blob);
            link.download = fileName;
            link.click();
            window.URL.revokeObjectURL(link.href);
          }
        });
      },

4、申明：

              本文修改自：https://blog.csdn.net/weixin_43876684/article/details/86322682