是否有取消window.onbeforeunload的回调

问题描述：

我没有这方面的实际用例，但我很好奇，是否有办法做出反应（回调），如果用户在触发window.onbeforeunload时点击停留在此页面上。

I don't have an actual use case for this, but I'm curious, whether there is a way to react (callback), if a user clicks on "stay on this page" when window.onbeforeunload was triggered.

http://jsfiddle.net/rWHU9/

function warning(){
    if(true){
      console.log('leaving');
      return "You are leaving the page";
    }
}
window.onbeforeunload = warning;

答

停留在页面上没有回调，但有一个用于离开页面， window.unload 。

There is no callback for staying on the page, but there is one for leaving the page, window.unload.

尝试在 beforeunload 中设置超时，然后在卸载时清除它。如果你留下，超时将会运行，否则它将被清除。

Try setting a timeout in beforeunload, then clear it in unload. If you stay, the timeout will run, otherwise it'll be cleared.

var timeout;

function warning() {
    timeout = setTimeout(function() {
        alert('You stayed');
    }, 1000);
    return "You are leaving the page";
}

function noTimeout() {
    clearTimeout(timeout);
}

window.onbeforeunload = warning;
window.unload = noTimeout;

DEMO： http://jsfiddle.net/aPwfz/1/

是否有取消window.onbeforeunload的回调

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