function creatRandomNum(n){                   var Random = 0;                       RandomCeil = Math.ceil(Math.random()*Math.pow(10,n));                       RandomVar = RandomCeil / Math.pow(10,n);                      //RandomVar为RandomCeil对应的正整数                      //n为指定的位数                      return {"RandomCeil":RandomCeil,"RandomVar":RandomVar};             }