html2Canvas + jsPDF

``
/*
@ html2Canvas
@ jsPdf
执行: this.getPdf(node,name)
nonde: 节点名;
name:导出的文件名
*/
// 导出页面为PDF格式
import html2Canvas from 'html2canvas'
import JsPDF from 'jspdf'
export default {
install(Vue, options) {
Vue.prototype.getPdf = function(item,name) {
// 导出之前先将滚动条置顶,不然会出现数据不全的现象
window.pageYOffset = 0;
document.documentElement.scrollTop = 0
document.body.scrollTop = 0

        const loading = this.$loading({
            lock: true,
            text: '导出中...',
            spinner: 'el-icon-loading',
            background: 'rgba(0, 0, 0, 0.7)'
        });
        html2Canvas(document.querySelector('#exportBox'), {
            allowTaint: true,
            useCORS: true,
            dpi:400,
            scale:8,
        }).then(function(canvas) {
            let contentWidth = canvas.width
            let contentHeight = canvas.height
            let pageHeight = contentWidth / 592.28 * 841.89
            let leftHeight = contentHeight
            let position = 0
            let imgWidth = 595.28 // A4纸宽度
            let imgHeight = 592.28 / contentWidth * contentHeight

            let pageData = new Image();
            //设置图片跨域访问
            pageData.setAttribute('crossOrigin', 'Anonymous');

            setTimeout(() => {
                pageData = canvas.toDataURL('image/jpeg', 1.0);
                let PDF = new JsPDF('', 'pt', 'a4')
                if (leftHeight < pageHeight) {
                        // debugger
                    PDF.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight)
                } else {
                    while (leftHeight > 0) {
                        PDF.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight)
                        leftHeight -= pageHeight
                        position -= 841.89
                        if (leftHeight > 0) {
                            PDF.addPage()
                        }
                    }
                }
                loading.close();
                PDF.save(name + '.pdf')
            }, 1000);
        })
    }
}

}
``