self.location.href;
window.location.href;
this.location.href;
location.href;
parent.location.href;
top.location.href;
window.location.href与location.href,self.location.href,location.href都是本页面跳转
"parent.location.href是上一层页面跳转"
"top.location.href是最外层的页面跳转"