问如有必要，将字段添加到表单中

EN

class MyForm(forms.Form):
    original_field = forms.CharField()
    extra_field_count = forms.CharField(widget=forms.HiddenInput())

    def __init__(self, *args, **kwargs):
        extra_fields = kwargs.pop('extra', 0)

        super(MyForm, self).__init__(*args, **kwargs)
        self.fields['extra_field_count'].initial = extra_fields

        for index in range(int(extra_fields)):
            # generate extra fields in the number specified via extra_fields
            self.fields['extra_field_{index}'.format(index=index)] = \
                forms.CharField()



def myview(request):
    if request.method == 'POST':
        form = MyForm(request.POST, extra=request.POST.get('extra_field_count')
        if form.is_valid():
            print "valid!"
    else:
        form = MyForm()
    return render(request, "template", { 'form': form })

form_count = Number($("[name=extra_field_count]").val());
// get extra form count so we know what index to use for the next item.
$("#add-another").click(function() {
    form_count ++;

    element = $('<input type="text"/>');
    element.attr('name', 'extra_field_' + form_count);
    $("#forms").append(element);
    // build element and append it to our forms container

    $("[name=extra_field_count]").val(form_count);
    // increment form count so our view knows to populate 
    // that many fields for validation
})

<form>
<div id="forms">
    {{ form.as_p }}
</div>
<button id="add-another">add another</button>
<input type="submit" />
</form>