点击打印按钮-打印窗口打开触发的事件: window.onbeforeprint
function printmsg (){
console.log("dayin");
};
window.onbeforeprint =printmsg;
打印(保存)/取消事件window.onafterprint,但是监测不到是打印(保存)还是取消事件。
function printmsg (){
console.log("dayinafter");
};
window.onafterprint =printmsg;