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window.onbeforeunload = onbeforeunload_handler;
window.onunload = onunload_handler;
function onbeforeunload_handler(){
var warning="退出将不保存您填写的数据,确定退出吗??";
return warning;
}
function onunload_handler(){
var warning="退出将不保存您填写的数据,确定退出吗?";
alert(warning);
}formObj.onsubmit = function () {
window.onbeforeunload = null;
window.onunload = null;
}