jsPDF和cordova无法查看pdf文件

Question

我正在尝试为我的应用生成PDF发票，我可以进入'console.log（“写成功”）行;'但我找不到文件。请帮忙！！！如何将其保存到手机中的文件夹???

console.log("generating pdf...");
var doc = new jsPDF();

doc.text(20, 20, 'HELLO!');

doc.setFont("courier");
doc.setFontType("normal");
doc.text(20, 30, 'This is a PDF document generated using JSPDF.');
doc.text(20, 50, 'YES, Inside of PhoneGap!');

var pdfOutput = doc.output();
console.log( pdfOutput );

//NEXT SAVE IT TO THE DEVICE'S LOCAL FILE SYSTEM
console.log("file system...");
window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function(fileSystem) {

   console.log(fileSystem.name);
   console.log(fileSystem.root.name);
   console.log(fileSystem.root.fullPath);



fileSystem.root.getFile("test.pdf", {create: true}, function(entry) {
      var fileEntry = entry;
      console.log(entry);

      entry.createWriter(function(writer) {
         writer.onwrite = function(evt) {
         console.log("write success");
      };

      console.log("writing to file");
         writer.write( pdfOutput );
      }, function(error) {
         console.log(error);
      });

   }, function(error){
      console.log(error);
   });
},
function(event){
 console.log( evt.target.error.code );