php 如何做弹框提醒
php 怎么做弹框提醒
需要定时给消息接收者一个弹框提醒，类似QQ邮箱接收到新邮件的那种弹框提醒
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很好用：http://download.csdn.net/detail/dmtnewtons/4219436
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JS定时器啊, 别指望HTTP服务器来告诉你.
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不可以
sleep 暂停了当前程序的执行，并没有关闭当前的 http 会话
这样的话，每个用户上来都要占用一个 socket 连接。系统的资源很快就会耗尽了
值得注意的是，有很多人试图用 ajax 去模拟长连接。这是自欺欺人的作法
没有任何资料显示，作为 ajax 核心部件的 XMLHttpRequest 具有连接重用的能力
既然如此，你在服务器端不就是白等了吗
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