Extjs ScriptTagProxy 的使用注意点

ScriptTagProxy 当向服务器请求时，会自动带一个callback参数,如下：

http://xxxxxx/get_json?_dc=1285827704378&callback=stcCallback100

同时要求服务器回写 json数据时前面要包含这个 callback 参数的值，结构如下：

stcCallback100({"totalCount": "1234", "topics": [{"forumid": "7", "author": "author", 

"lastpost": "1285803622", "threadid": "1112", "title": "title", "excerpt": "aaaa", "forumtitle": "ext", "lastposter": "xulong"}]})

下面是 服务器使用 django 的代码:

def contract_json(request):
  callback=request.GET.get("callback")
  jsonData={"totalCount":"1234","topics": 
      [{"threadid":"1112","forumid":"7","forumtitle":"ext",
        "title":"title","author":"author","lastposter":"xulong",
      "lastpost":"1285803622","excerpt":"aaaa"}]
       }
  res = HttpResponse()
  res.write(callback)
  res.write('(')
  res.write(json.dumps(jsonData))
  res.write(')')
  return res