关于读卡器读取卡号从网页上获取

mounted() {cardvalue = "";let that = thisdocument.onkeydown = function(e) {let _key = String.fromCharCode(window.event.keyCode);if (_key >= 0 || _key <= 9) {cardvalue = cardvalue + _key;}// 读完之后就会有一次回车操作 window.event.keyCode if (window.event.keyCode == 13 && cardvalue.trim().length > 1) {that.cardvalue = parseInt(cardvalue);cardvalue = "";} else if (window.event.keyCode == 13) {cardvalue = "";}};
}