ThinkPHP 防止表单重复提交的方法
然而有一种情况，是防止不了的：
用户提交表单以后，点击浏览器后退按钮返回表单页面，这个时候浏览器会直接从缓存中取出页面，因此token验证一定是通不过的。
网上有许多种办法可以绕过这个问题，比如用location.replace()方法来替换当前历史记录，但是这样仍然有瑕疵。极端的情况，若用户在页面间切换多次，那么多点几次后退按钮很可能又回到了上一个表单页面。
解决办法是在http头中设置Cache-Control: no-cache, no-store。然而我尝试了无论是在页面head中添加 还是在Action中输出 header("Cache-control: no-cache, no-store") 都无效。
查找了很久，发现问题出在ThinkPHP的模板渲染机制上，打开 ThinkPHP/Lib/Think/Core/View.class.php 看第173行
header("Cache-control: private"); //支持页面回跳
|
原来TP为了支持页面回跳，强制在每个模板输出之前都发送了一个Cache-control: private的头，这可真是帮了倒忙了。
把这行注释掉，删除TP核心缓存，再试一次，发现HTTP响应头成功改变了
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