当用户在浏览器中按返回按钮时，关闭打印对话框

Question

当用户在浏览器中按下后退按钮时，我需要Java脚本代码来关闭打印对话

我尝试了以下代码

<script>


    window.onhashchange = function() {
        if (window.innerDocClick) {
            //Your own in-page mechanism triggered the hash change
        } else {
            //Browser back button was clicked
            //window.close;
        alert("ddd");
        }
    }

</script>