已知函数 $f\left(x\right)=\left|\ln x\right|$， $g\left(x\right)=\left\{\begin{array}{l}0,0\le x\le 1\\ \left|x^2-4\right|-2,x>1\end{array}\right.$，则方程 $\left|f\left(x\right)+g\left(x\right)\right|=1$实根的个数为