Merge branch 'release/1.0' of http://git.yoho.cn/fe/yoho-blk into release/1.0

@@ -16,6 +16,8 @@ var $result,
     $upload,
     $filename;
 
+var uping;
+
 var num,
     inter,
     callback;
@@ -26,42 +28,45 @@ $result = $('#yoho-upload-result');
 $upload = $('#yoho-upload');
 $filename = $upload.find('.file-name');
 
+function up(opt) {
+    if (uping) {
+        return;
+    }
+
+    $filename.click();
+    if (opt && typeof opt.callback === 'function') {
+        callback = opt.callback;
+    } else {
+        callback = '';
+    }
+}
+
 function getResponse(cb) {
     num = 0;
     inter = setInterval(function() {
         var res = $result[0].contentDocument.body.innerText || '';
 
-        if (res) {
+        if (num > 20 || res) {
+            uping = false;
             clearInterval(inter);
+        }
+
+        num++;
 
+        if (res) {
+            clearInterval(inter);
             $result[0].contentDocument.body.innerText = '';
             if (cb) {
                 return cb($.parseJSON(res));
             }
         }
-
-        if (num > 20 || res) {
-            clearInterval(inter);
-        }
-
-        num++;
     }, 500);
 }
 
-function up(opt) {
-    $filename.click();
-    if (opt) {
-        callback = null;
-        callback = opt.callback;
-    } else {
-        callback = '';
-    }
-
-    $filename.off('change').on('change', function() {
-        $upload.submit();
-        getResponse(callback);
-    });
-}
-
+$filename.change(function() {
+    uping = true;
+    $upload.submit();
+    getResponse(callback);
+});
 
 exports.up = up;