Mike eats breakfast five times a week . He doesn't eat breakfast on Saturday and Sunday . He washes the dishes twice a week . He washes them on Saturday and Sunday . He waters the plants four times a week . He doesn't water them on Monday , Wednesday and Friday . He always sets the table . He sets the table from Sunday to Saturday . He washes his dog once a week . He washes it only on Saturday . He goes swimming twelve times a month . He swims on Monday , Wednesday and Friday . But he never cleans his room .

若函数$f\left(x\right)=\left|x+2a\right|-1$图象关于x=1对称，则实数a的值为（     ）