如何在遇到某个条件时阻止onbeforeunload触发？ [英] how can i prevent onbeforeunload from firing when a certain condition is met?

问题描述

我有一个页面，我想确认用户是否想要离开。
我只有在满足某个条件时才需要确认，所以我写了这样的代码

i have a page on which i want to confirm if the user wants to leave. i have to confirm only when a certain condition is met so i wrote code like this

var back=false;
back=//check if user pressed back button
window.onbeforeunload = function (e) {
    alert(back);   //this alerts true
    if(back==true)
        return false;
        //e.preventDefault;   --this does not work too
};

但这不起作用。我的意思是当我点击后退按钮时，这个onbeforeunload仍然会触发，即使我返回false，我仍然会收到确认消息。什么可能是错的？
谢谢

but this does not work. i mean when i click on back button this onbeforeunload still fires and i still get the confirmation message even when i m returning false.Whats can be wrong? Thanks

推荐答案

如果要为用户提供中止卸载的选项，请返回一个字符串。在其他情况下不返回任何内容。

Return a string if you want to offer an option to the user to abort the unload. Return nothing in other cases.

var back = false;
back = true; //Somewhere, the condition is set to true
window.onbeforeunload = function (e) {
    if(back == true)
        return "Are you sure to exit?";
}

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