jQuery .on（「unload」，fn）不適合我

Question

我試圖檢測用戶何時離開頁面。我認爲.on（「unload」，fn）方法應該這樣做：

$(document).ready(function(){ 
    $(window).on("unload", function(){ 
    alert("Goodbye!"); 
    }); 
}); 

但它似乎沒有工作。當我離開頁面時沒有任何反應。但是，如果將「卸載」更改爲「加載」，則警告框會在頁面加載時適當地顯示。

這是正確的方式去做我想要的嗎？

Answer 1

可能：

<script language="JavaScript"> 
    window.onbeforeunload = confirmExit; 
    function confirmExit() 
    { 
    return "You have attempted to leave this page. If you have made any changes to the fields without clicking the Save button, your changes will be lost. Are you sure you want to exit this page?"; 
    } 
</script> 

從http://www.4guysfromrolla.com/demos/OnBeforeUnloadDemo1.htm

「beforeunload」 採取的措施將是一個事件比 「卸載」 之一，它似乎跟棄用更可靠。我也讀了「beforeunload」事件是更可靠的從JavaScript稱爲比jQuery的

所以你的情況時：

$(document).ready(function(){ 
     window.onbeforeunload = confirmExit; 
     function confirmExit() 
     { 
     return "You have attempted to leave this page. If you have made any changes to the fields without clicking the Save button, your changes will be lost. Are you sure you want to exit this page?"; 
     } 
});