删除onbeforeunload上的提示框

Question

  

可能重复：
  How to remove prompt on unload event using javascript

我正在开发一个运行onbeforeunload和onunload的javascript，现在脚本通常运行正常，但是在IE和Firefox上它会运行一个提示，询问你是否要离开，无论你选择哪个选择剩下的代码仍然执行。现在在chrome和Safari上它没有这个问题。我试图弄清楚为什么IE和Firefox会这样做，并试图将它从显示一个提示框中删除所有这里是我有的代码，如果它有帮助。

感谢您的协助。

var leave_message = document.getElementById("kioskform:broswerCloseSubmit");
var leave_safari = document.getElementById("kioskform:broswerCloseSafari");

function goodbye(e) {
    if (!validNavigation) {
        if (dont_confirm_leave!==1) {
            leave_message.click();
            if(!e) e = window.event;

            //e.cancelBubble is supported by IE - this will kill the bubbling process.
            e.cancelBubble = true;
            e.returnValue = leave_message.click();

            //e.stopPropagation works in Firefox.
            if (e.stopPropagation) {
                e.stopPropagation();
                e.preventDefault();
            }

            //return works for Chrome and Safari
            //canceling this makes IE work well but not make Safari work at all.
            leave_safari.click();
        }
    }
}

window.onbeforeunload=goodbye;
window.onunload=leave; 

function leave() {
    document.getElementById('kioskform:broswerCloseSubmit').click();           
}