刷新页面前的提示

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 function addHandler( type, handle){
        if (window.addEventListener) {
            return ele.addEventListener(type,handle,false);
        }else if (window.attachEvent) { // 兼容IE
            return window.attachEvent("on"+type,handle);
        }else{
            return window["on"+type] = handle;
        };
    }

addHandler("beforeunload",function(e){
    e = e || window.event;
    var mes = "要关闭我么？"
    e.returnValue = mes;
    return mes;
})