如何获取window.print()打印回调事件

//定义打印前事件 
 var beforePrint = function() {
	console.log("beforePrint");
}; 
//定义打印后事件 
var afterPrint = function() {
	console.log("afterPrint");
}

//监听window状态
if (window.matchMedia) {
   var mediaQueryList = window.matchMedia('print'); 
   //为印添加事件
   mediaQueryList.addListener(function(mql) {
	   if (mql.matches) {
		   beforePrint();
	   } else {
		   afterPrint();
	   }
   });
 }
//打印前事件
window.onbeforeprint = beforePrint;
//打印后事件
window.onafterprint = afterPrint;
$("#print").click(function(){
	 //执行打印
	window.print();
});