已知直线\(l:\begin{cases} x=1+\dfrac{\sqrt{2}}{2}t \\ y=\dfrac{\sqrt{2}}{2}t \end{cases}\)\((\)\(t\)为参数\()\),曲线\({{C}_{1}}:\begin{cases} x=2\cos \theta \\ y=\sqrt{3}\sin \theta \end{cases}\)\((\)\(\theta \)为参数\()\).
\((1)\)求直线\(l\)与曲线\({{C}_{1}}\)的普通方程;
\((2)\)已知点\(F\left( 1,0 \right),{{F}_{1}}\left( -1,0 \right)\),若直线\(l\)与曲线\({{C}_{1}}\)相交于\(A,B\)两点\((\)点\(A\)在点\(B\)的上方\()\),求\(\left| {{F}_{1}}A\left| - \right|{{F}_{1}}B \right|\)的值.