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检测登陆情况

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检测登陆情况

想问一下一般网站都会检测用户的登陆情况，如果用户浏览的页面没有登陆就会跳转到登陆页面是怎么做到的？我是每个页面都去判断登陆了没，怎样才能做到只判断一次呢？


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如果你是用的面向对象，可以写个基础类，判断是否登录，其他类继承她
如果你是用面向过程，可以通过引进文件的方法实现，在这个文件里面判断是否已经登录


与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
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