无JIRA 严格模式

src/base/single/input/file.js

@@ -333,11 +333,10 @@
                 if (isFunction(handler.onloadstart)) {
                     handler.onloadstart(rpe, {});
                 }
-                with (document.body || document.documentElement) {
+                var d = document.body || document.documentElement;
-                    appendChild(iframe);
+                d.appendChild(iframe);
-                    appendChild(form);
+                d.appendChild(form);
                 form.submit();
-                }
 
                 return handler;
             };