func (f *FormEncode) Add(key string, v reflect.Value, sf reflect.StructField) (err error) {
	// 1.提取数据
	var fc formContent
	if err := genFormContext(key, v, sf, &fc); err != nil {
		return err
	}
	// 2.生成formdata格式数据

	return f.createForm(key, &fc)

}
// Add Encoder core function, used to set each key / value into the http form-data
Add Encoder core function, used to set each key / value into the http form-data
// Add Encoder core function used to set each key / value into the http form - data
func (f *FormEncode) Add(key string, v reflect.Value, sf reflect.StructField) (err error) {
	var fc formContent
	if err := genFormContext(key, v, sf, &fc); err != nil {
		return err
	}
	return f.createForm(key, &fc)
}
func ( f * FormEncode ) Add ( key string , v reflect . Value , sf reflect . StructField ) ( err error ) { var fc formContent if err := genFormContext ( key , v , sf , & fc ) ; err != nil { return err } return f . createForm ( key , & fc ) }
Add Encoder core function, used to set each key / value into the http form-data
Add Encoder core function used to set each key / value into the http form - data
// 1.提取数据 // 2.生成formdata格式数据