JS汉诺塔递归问题

[zilan830]

var hanoi=function(disc,src,aux,dst){if(disc>0){hanoi(disc-1,src,dst,aux);document.writeln(' Move disc '+disc+' from '+src+' to '+dst);hanoi(disc-1,aux,src,dst);}}
hanoi(3,'Src','Aux','Dst');
运行结果是：Move disc 1 from Src to Dst

Move disc 2 from Src to Aux

Move disc 1 from Dst to Aux

Move disc 3 from Src to Dst

Move disc 1 from Aux to Src

Move disc 2 from Aux to Dst

Move disc 1 from Src to Dst
我想请大神跟我讲解一下运作过程，理解不能啊。谢谢！