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File.prototype.convertToBase64 = function(callback){
            var FR= new FileReader();
            FR.onload = function(e) {
                 callback(e.target.result)
            };       
            FR.readAsDataURL(this);
    }

    $("#asd").on('change',function(){
      var selectedFile = this.files[0];
      selectedFile.convertToBase64(function(base64){
           alert(base64);
      }) 
    });