使用Javascript在页面刷新时调用函数(Call a function on page refresh using Javascript)

使用Javascript在页面刷新时调用函数(Call a function on page refresh using Javascript) function warnuser() { return "Don't refresh the page."; } window.onbeforeunload = warnuser;

如果用户刷新页面并且用户在确认框上单击“离开此页面”，我想调用javascript函数，否则不会！ 我很困惑如何做到这一点。 谢谢

function warnuser() { return "Don't refresh the page."; } window.onbeforeunload = warnuser;

If the user refreshes the page and the user clicks 'leave this page' on confirmation box, i want to call a javascript function , otherwise not! I am confused about how to do that. Thank you

最满意答案

您需要拦截F5键按下并仅在这种情况下设置onbeforeunload处理程序：

document.addEventListener('keydown', function(e) { if(e.which == 116) { window.onbeforeunload = function() { window.onbeforeunload = null; return "Do you really want to refresh the page?"; } } }, false);

演示： http ： //jsfiddle.net/ejDrq/

请注意，如果用户单击 “刷新”按钮，则不起作用。 拦截这个是不可能的。

You need to intercept the F5 key press and setup the onbeforeunload handler only in that case:

document.addEventListener('keydown', function(e) { if(e.which == 116) { window.onbeforeunload = function() { window.onbeforeunload = null; return "Do you really want to refresh the page?"; } } }, false);

Demo: http://jsfiddle.net/ejDrq/

Note that this does not work if the user clicks the Refresh button. It is impossible to intercept this.