当我试图在我的RGBcolorexperiment上移动位时我注意到我无法移动可变位数。Swift书中只说你“向左/向右移动一个数字”„Thebitwiseleftshiftoperator(>)moveallbitsinanumbertotheleftortherightbyacertainnumberofplaces,accordingtotherulesdefinedbelow.“是否仅能移动预定义的位数？//Worksfine:letshiftMe:UInt32=0xFF0000letshiftedConst=shiftMe>>16//Doesn'twork:letshiftM