self.location.href;
window.location.href;
this.location.href;
location.href;
parent.location.href;
top.location.href;
window.location.href與location.href,self.location.href,location.href都是本頁面跳轉
"parent.location.href是上一層頁面跳轉"
"top.location.href是最外層的頁面跳轉"