2.
如图,在同一个平面内,向量\(\overrightarrow{{OA}}{,}\overrightarrow{{OB}}{,}\overrightarrow{{OC}}\)的模分别为\(1{,}1{,}\sqrt{2}{,}\overrightarrow{{OA}}\)与\(\overrightarrow{{OC}}\)的夹角为\(\alpha\),且\(\tan\alpha{=}7{,}\overrightarrow{{OB}}\)与\(\overrightarrow{{OC}}\)的夹角为\({45}^{∘} \)。若\(\overrightarrow{{OC}}{=}m\overrightarrow{{OA}}{+}n\overrightarrow{{OB}}(m{,}n{∈}R)\),则\(m{+}n{=}\) ______ .