TA的每日心情  | 开心 2021-12-13 21:45 | 
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  签到天数: 15 天 [LV.4]偶尔看看III  
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 解决方案:JsonResponse(data, json_dumps_params={"ensure_ascii":False})  
! data是需要渲染的字典  
  
- def master(request):
 -     data = {"这是":"主页"}
 -     return  JsonResponse(data, json_dumps_params={"ensure_ascii":False})
 
  复制代码 
  
 显示效果:   
   
首先我们看JsonResponse()的源码:  
  
- class JsonResponse(HttpResponse): 
 -   def __init__(self, data, encoder=DjangoJSONEncoder, safe=True,
 -     json_dumps_params=None, **kwargs):
 -     if safe and not isinstance(data, dict):
 -       raise TypeError(
 -       "In order to allow non-dict objects to be serialized set the "
 -       "safe parameter to False."
 -       )
 -     if json_dumps_params is None:
 -       json_dumps_params = {}
 -     kwargs.setdefault("content_type", "application/json")
 -      data = json.dumps(data, cls=encoder, **json_dumps_params)
 -      super(JsonResponse, self).__init__(content=data, **kwargs)
 
  复制代码 
  
 这里我们从根源开始找它编码错误的原因:  
JsonResponse()在初始化的时候使用了json.dumps()把字典转换成了json格式,具体方法如下:  
  
- data = json.dumps(data, cls=encoder, **json_dumps_params)
 
  复制代码 
  
接下来我们看看json.dumps()的源码:  
  
- def dumps(obj, skipkeys=False, ensure_ascii=True, check_circular=True,
 -         allow_nan=True, cls=None, indent=None, separators=None,
 -         default=None, sort_keys=False, **kw):
 -     if (not skipkeys and ensure_ascii and
 -         check_circular and allow_nan and
 -         cls is None and indent is None and separators is None and
 -         default is None and not sort_keys and not kw):
 -         return _default_encoder.encode(obj)
 -     if cls is None:
 -         cls = JSONEncoder
 -     return cls(skipkeys=skipkeys, ensure_ascii=ensure_ascii,
 -         check_circular=check_circular, allow_nan=allow_nan,         
 -         indent=indent,separators=separators, default=default, 
 -         sort_keys=sort_keys,**kw).encode(obj)    
 
  复制代码 
  
 源码注释原文:If ``ensure_ascii`` is false, then the return value can contain non-ASCII characters if they appear in strings contained in ``obj``. Otherwise, all such characters are escaped in JSON strings.  
 也就是说ensure_ascii是false的时候,可以返回非ASCII码的值,否则就会被JSON转义。 
  
所以含有中文的字典转json字符串时,使用 json.dumps() 方法要把ensure_ascii参数改成false,即 json.dumps(dict,ensure_ascii=False)。  
JsonResponse()接收参数有关键词参数,json_dumps_params=None ,用来给 json.dumps() 传参,所以 要在关键字参数后面拼个字典来传另一组关键字参数 ensure_ascii=False,即:  
json_dumps_params={"ensure_ascii":False}  
综上可解决使用 JsonResponse() 强制把含有中文的字典转json并返回响应,前端渲染编码错误的问题。  
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