如何检测window.print（）完成

在FireFox和Internet Explorer中，您可以侦听打印后事件。

window.onafterprint = function(){   console.log("Printing completed...");}

可能可以使用window.matchMedia在其他浏览器中获得此功能。

(function() {    var beforePrint = function() {        console.log('Functionality to run before printing.');    };    var afterPrint = function() {        console.log('Functionality to run after printing');    };    if (window.matchMedia) {        var mediaQueryList = window.matchMedia('print');        mediaQueryList.addListener(function(mql) { if (mql.matches) {     beforePrint(); } else {     afterPrint(); }        });    }    window.onbeforeprint = beforePrint;    window.onafterprint = afterPrint;}());