提示并阻止用户导航/关闭页面

Question

根据StackOverflow在添加问题或回复问题时如何执行此操作;

我想用一个提示用户;

"Are you sure you want to navigate away from this page"
"Press OK to continue or Cancel to stay on this page"

我已经尝试过在互联网上找到的几个js片段,但没有什么可以减少芥末.

Answer 1

您需要实现window.onbeforeunload并将其作为字符串从中返回:

window.onbeforeunload = function() {
    if (theUserHasStartedEditing) {
        return "You have started writing or editing a post."
    }
}