使用html2canvas将页面转成图并使用用canvas2image下载

npm install html2canvas canvas2image --save

import html2canvas from 'html2canvas';
require('./canvas2image.js');

(function($){
    Canvas2Image = function () {
    ...
    }
}

Canvas2Image.saveAsImage(canvasObj, width, height, type)
Canvas2Image.saveAsPNG(canvasObj, width, height)
Canvas2Image.saveAsJPEG(canvasObj, width, height)
Canvas2Image.saveAsGIF(canvasObj, width, height)
Canvas2Image.saveAsBMP(canvasObj, width, height)

Canvas2Image.convertToImage(canvasObj, width, height, type)
Canvas2Image.convertToPNG(canvasObj, width, height)
Canvas2Image.convertToJPEG(canvasObj, width, height)
Canvas2Image.convertToGIF(canvasObj, width, height)
Canvas2Image.convertToBMP(canvasObj, width, height)

        methods: {
            toImage() {
                let _this = this;
                html2canvas(this.$refs.index,{
                    backgroundColor: null
                }).then((canvas) => {
                    let _dataURL = canvas.toDataURL("image/png");                    
                    // _this.dataURL = _dataURL;
                    Canvas2Image.saveAsPNG(canvas)
                });
            },