# Functions
ConvByFieldName use reflect to fill 'to' with from by name like to.Name = from.Name to must be a struct pointer.
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ConvSliceByFieldName use reflect to fill 'to' slice with from by name.
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MakeSliceWithNew 以from的长度新建to,并为元素分配内存 因为make([]*T, len(from))只会把元素都设为nil.