Javascript 下面如何定义此变量？

我有一个取消按钮，当用户上传文件时会出现。如果用户希望取消文件上载，则可以单击“取消”按钮，并向用户显示“取消”消息

尝试此操作时唯一的问题是，它表明要显示消息的stopImageUpload函数中未定义cancel_image_file_name。但我确实在startImageUpload函数中定义了这一点。所以我的问题是，如何从startImageUpload函数中获取cancel_image_file_名称，并在stopImageUpload函数中定义它

下面是显示2个功能的代码：

startImageUpload功能：

var cancelimagecounter = 0;

function startImageUpload(imageuploadform, imagefilename){

    cancelimagecounter++;

            var _cancelimagecounter = cancelimagecounter;

    $('.imageCancel').on("click", function(event) {
        var cancel_image_file_name = $(this).attr('cancel_image_file_name');

    return stopImageUpload(2, cancel_image_file_name);

});       
      return true;
}

var imagecounter = 0;

function stopImageUpload(success, imagefilename){

      var result = '';
      imagecounter++;

      if (success == 1){
         result = '<span class="imagemsg'+imagecounter+'">The file was uploaded successfully!</span><br/><br/>';      
         $('.listImage').eq(window.lastUploadImageIndex).append('<div>' + htmlEncode(imagefilename) + '<button type="button" class="deletefileimage" image_file_name="' + imagefilename + '">Remove</button><br/><hr/></div>'); 
      }
      else if (success == 2){
          result = '<span class="imageemsg">' + cancel_image_file_name + ' Upload Was Cancelled!</span><br/><br/>';
      }
      else {
         result = '<span class="imageemsg">There was an error during file upload!</span><br/><br/>';
      }


      return true;   
}

stopImageUpload功能：

var cancelimagecounter = 0;

function startImageUpload(imageuploadform, imagefilename){

    cancelimagecounter++;

            var _cancelimagecounter = cancelimagecounter;

    $('.imageCancel').on("click", function(event) {
        var cancel_image_file_name = $(this).attr('cancel_image_file_name');

    return stopImageUpload(2, cancel_image_file_name);

});       
      return true;
}

var imagecounter = 0;

function stopImageUpload(success, imagefilename){

      var result = '';
      imagecounter++;

      if (success == 1){
         result = '<span class="imagemsg'+imagecounter+'">The file was uploaded successfully!</span><br/><br/>';      
         $('.listImage').eq(window.lastUploadImageIndex).append('<div>' + htmlEncode(imagefilename) + '<button type="button" class="deletefileimage" image_file_name="' + imagefilename + '">Remove</button><br/><hr/></div>'); 
      }
      else if (success == 2){
          result = '<span class="imageemsg">' + cancel_image_file_name + ' Upload Was Cancelled!</span><br/><br/>';
      }
      else {
         result = '<span class="imageemsg">There was an error during file upload!</span><br/><br/>';
      }


      return true;   
}

var-imagecounter=0；
函数stopImageUpload（成功，imagefilename）{
var结果=“”；
imagecounter++；
如果（成功==1）{
结果='文件已成功上载！

'；
$（'.listImage'）.eq（window.lastUploadImageIndex）.append（''+htmlEncode（imagefilename）+'Remove
）；
}
否则如果（成功==2）{
结果=''+取消图像文件名+'上载已取消！

；
}
否则{
结果='上传文件时出错！

'；
}
返回true；
}

在JavaScript中变量具有函数级作用域，要在其他函数中也获得

取消图像文件名

，请在两个函数之外定义它

---

顺便说一句，您可以从

stopmageupload

函数中使用

imagefilename

，因为您已经将其传递给该函数：

return stopImageUpload(2, cancel_image_file_name);

因此，在您的

stopImageUpload

函数中，更改行：

result = '<span class="imageemsg">' + cancel_image_file_name + ' Upload Was Cancelled!</span><br/><br/>';

result=''+取消图像文件名+'上载已取消

；

致：

result=''+imagefilename+'上载已取消

；

在JavaScript中变量具有函数级作用域，要在其他函数中也获得

取消图像文件名

，请在两个函数之外定义它

---

顺便说一句，您可以从

stopmageupload

函数中使用

imagefilename

，因为您已经将其传递给该函数：

return stopImageUpload(2, cancel_image_file_name);

因此，在您的

stopImageUpload

函数中，更改行：

result = '<span class="imageemsg">' + cancel_image_file_name + ' Upload Was Cancelled!</span><br/><br/>';

result=''+取消图像文件名+'上载已取消

；

致：

result=''+imagefilename+'上载已取消

；

您已经将该值作为第二个参数传递给“stopImageUpload”、“imagefilename”。就用这个吧

---

实际上，在同一个函数的其他地方，您正在使用该参数。

您已经将该值作为第二个参数传递给了“stopImageUpload”、“imagefilename”。就用这个吧

---

事实上，在同一函数的其他地方，您正在使用该参数。

按如下方式重新构造代码：

(function() {
    var cancelimagecounter = 0,
        imagecounter = 0,
        cancel_image_file_name;
    window.startImageUpload = function(imageuploadform,imagefilename) {
        ...
            cancel_image_file_name = ... // (remove the var)
        ...
    };
    window.stopImageUpload = function(success,imagefilename) {
        ...
        // cancel_image_file_name is not undefined now.
    };
})();

---

按如下方式重新构造代码：

(function() {
    var cancelimagecounter = 0,
        imagecounter = 0,
        cancel_image_file_name;
    window.startImageUpload = function(imageuploadform,imagefilename) {
        ...
            cancel_image_file_name = ... // (remove the var)
        ...
    };
    window.stopImageUpload = function(success,imagefilename) {
        ...
        // cancel_image_file_name is not undefined now.
    };
})();

---

嗨，谢谢你，这已经删除了错误。我只有一个小问题，对于imagefilename，它显示“未定义”。例如，如果我试图取消文件“Tulips.png”，那么它应该显示“Tulips.png Upload Was Canceled”，但它显示的是“undefined Upload Was Canceled”，你知道这是为什么吗？@user1391585:确保此行

var cancel\u image\u file\u name=$（this）.attr（'cancel\u image\u file\u name'）

返回一些值。嗨，谢谢，这已经消除了错误。我只有一个小问题，对于imagefilename，它显示“未定义”。例如，如果我试图取消文件“Tulips.png”，那么它应该显示“Tulips.png Upload Was Canceled”，而不是显示“undefined Upload Was Canceled”，你知道为什么吗？@user1391585：确保此行

var cancel\u image\u file\u name=$（this）.attr（'cancel\u image\u file\u name'）

返回一些值。