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def foo(request):
 
 
    if request.method=="POST":
 
        regForm=RegForm(request.POST)
 
        if regForm.is_valid():
            pass
            # 可用数据: regForm.cleaned_data,
            # 将数据插入数据库表中
 
 
        else:
            pass
            # 可用数据: regForm.errors
            # 可以利用模板渲染讲errors嵌套到页面中返回
            # 也可以打包到一个字典中,用于ajax返回
 
    else:
        regForm=RegForm()
    return render(request,"register.html",{"regForm":regForm})
 
     
 
    '''
    实例化时:
 
        self.fields={
            "username":"字段规则对象",
            "password":"字段规则对象",
 
        }
 
 
    is_valid时:
 
        self._errors = {}
        self.cleaned_data = {}
 
 
        #局部钩子:
 
        for name, field in self.fields.items():
              try:
 
                    value = field.clean(value)
                    self.cleaned_data[name] = value
                    if hasattr(self, 'clean_%s' % name):
                        value = getattr(self, 'clean_%s' % name)()
                        self.cleaned_data[name] = value
              except ValidationError as e:
                    self.add_error(name, e)
 
        # 全局钩子:
 
        self.clean()     # def self.clean():return self.cleaned_data
 
        return  not self.errors    # True或者False
 
 
    '''　　

示例：

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from django import forms
 
class LoginForm(forms.Form):
    username = forms.CharField(label='username', max_length=100)
    password = forms.CharField(label='password', max_length=100)
     
    #钩子函数为对应字段添加判断条件
    def clean_username(self):
        if len(self.cleaned_data.get("username"))>5:
            print(self.cleaned_data.get("password"))
            return self.cleaned_data.get("username")
    def clean_password(self):
        pass
    #全局钩子函数
    def clean(self):
        if self.cleaned_data["password"] == self.cleaned_data["repeat_password"]:
            return self.cleaned_data