javascript - 如何从浏览器中读取 .AppImage

Question

我正在尝试使用 JS 从浏览器的拖放中读取 appimage，然后使用 node.js FS 模块将其保存在其他地方，我尝试了所有浏览器文件阅读器选项，但它们似乎都不起作用。 (他们都给了我一个与原始文件不同的文件大小)https://developer.mozilla.org/en-US/docs/Web/API/FileReader

function saveMe(readFile,filename) {
  var reader = new FileReader();
  // Read file into memory as UTF-16
  reader.readAsBinaryString(readFile, "UTF-16");
  // Handle progress, success, and errors
  reader.onprogress = ()=>{};
  reader.onloadend = ()=>{
      //console.log(reader.readyState);
      if(reader.readyState==2){
      //Create File './storage/apps/'+filename, reader.result
      console.log(reader.result);
        fs.writeFile('./storage/apps/'+filename,reader.result,(err)=>{
          if(err){
            console.log("Error While reading file");
          }else{

          }
        });
      }else{

      }
  };
  reader.onerror = ()=>{console.log("Error reading file")};
}

我应该使用哪种方法？
- FileReader.readAsArrayBuffer()
- FileReader.readAsBinaryString()
- FileReader.readAsDataURL()
- FileReader.readAsText()

Answer 1

读取为 UTF-16 并在写入时将其转换为 base64，同时将写入选项编码设置为 base64

function saveMe(readFile,filename) {
  var reader = new FileReader();
  // Read file into memory as UTF-16
  reader.readAsBinaryString(readFile, "UTF-16");
  // Handle progress, success, and errors
  reader.onprogress = ()=>{};
  reader.onloadend = ()=>{
      //console.log(reader.readyState);
      if(reader.readyState==2){
      //Create File './storage/apps/'+filename, reader.result
      //console.log(reader.result);
        fs.writeFile('./storage/apps/'+filename,window.btoa(reader.result),{encoding: "base64"},(err)=>{
          if(err){
            console.log("Error While reading file");
          }else{

          }
        });
      }else{

      }
  };
  reader.onerror = ()=>{console.log("Error reading file")};
}