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Home Backend Development PHP Tutorial exit作用真的这么大吗?

exit作用真的这么大吗?

Jun 23, 2016 pm 02:40 PM

正在编一个仓库管理系统。。入库没问题。。出库的时候。。
首先判定够不够,要是不够就
echo"<script>alert('此仓库没有这么多货物!!');history.go(-1);;</script>";

要是够的话后面就insert update。本来觉得跳转就已经可以防止后面insert update了,但是库存还是花花的减少啊,都成负数了。。。

一直想不明白,后来不知道咋想的后面加了句exit;貌似就好了?请问大大这是什么原理啊。。难道history.go(-1)跳转之后后面的还会继续运行?


回复讨论(解决方案)

这是肯定的。

这是肯定的。

这和函数不一样吗?要是跳到另外一个文件,本文件后面的还要执行?同时执行还是先执行完本文件的再执行跳转文件?

这是肯定的。
那是不是我要把我之前代码所有带跳转的后面都添加exit?

看情况吧,如果你不希望后面的代码执行了,那就加exit。

看情况吧,如果你不希望后面的代码执行了,那就加exit。

我一直以为后面代码自动不会运行的。。这下好了。。果然还要继续学习啊。。。还要加exit。。。

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