3.
已知函数\(f\left( x \right)\)是定义在\({R}\)上的奇函数,当\(x < 0\)时,\(f\left(x\right)={e}^{x}\left(x+1\right) \),给出下列命题:
\(①\)当\(x > 0\)时,\(f\left(x\right)=-{e}^{-x}\left(x-1\right) \);
\(②\)函数\(f\left( x \right)\)有\(2\)个零点;
\(③f\left( x \right) < 0\)的解集为\(\left( -\infty ,-1 \right)\cup \left( 0,1 \right)\),
\(④\forall {{x}_{1}},{{x}_{2}}\in R\),都有\(\left| f\left( {{x}_{1}} \right)-f\left( {{x}_{2}} \right) \right| < 2\).
其中正确命题的个数是\((\) \()\)