// 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(id, title,imgw,top) {
      return new Promise((resolve, reject) => {
        let get1id = id.replace('#','')
        debugger
        html2Canvas(document.querySelector(id), {
          allowTaint: true,
            backgroundColor: 'white',
            useCORS: true, //支持图片跨域
            scale: 1,     //设置放大的倍数
            height: document.getElementById(get1id).scrollHeight+200,
            windowHeight: document.getElementById(get1id).scrollHeight+200
        }).then(function(canvas) {
          debugger
          let contentWidth = canvas.width;
          let contentHeight = canvas.height;
          let pageHeight = (contentWidth / 592.28) * 841.89;
          let leftHeight = contentHeight;
          let position = top;
          const imgWidth = imgw;
          let imgHeight = (imgw / contentWidth) * contentHeight;
          let pageData = canvas.toDataURL("image/jpeg", 1.0);
          // let PDF = new JsPDF("", "pt");
          let PDF = new JsPDF("", "pt", "a4");
          // PDF.addImage(pageData, "JPEG", 0, 0, contentWidth, contentHeight);
          if (leftHeight < pageHeight) {
            PDF.addImage(pageData, "JPEG", 65, 10, imgWidth, imgHeight);
          } else {
            while (leftHeight > 0) {
              PDF.addImage(pageData, "JPEG", 65, position, imgWidth, imgHeight);
              leftHeight -= pageHeight;
              position -= 841.89;
              if (leftHeight > 0) {
                PDF.addPage();
              }
            }
          }


          PDF.save(title + ".pdf");
          resolve(11);
        });
      });
    };
  }
};