#### js頁面監聽掃碼槍 > 該方法可以直接放在js代碼中使用 ```javascript // 掃碼槍 var code = ""; var lastTime, nextTime; var lastCode, nextCode; document.onkeypress = function (e) { if (window.event) { // IE nextCode = e.keyCode; } else if (e.which) { // Netscape/Firefox/Opera nextCode = e.which; } if (nextCode === 13) { if (code.length < 3) return; // 手動輸入的時間不會讓code的長度大于2，所以這里只會對掃碼槍有 console.log(code); // 獲取到掃碼槍輸入的內容，做別的操作 // 得到掃碼槍的值,請求數據庫,返回結果 $.ajax({ type: "POST", url: "{:url('barcode_select')}", data: {barcode: code}, dataType: "json", success: function (res) { if (res.code == 0){ var data = res.data var shop_name = ''; for(var i = 0; i < (data.shopinfo).length; i++){ shop_name = data.shopinfo[i].name + '和' + shop_name } var shop_str = shop_name.substr(0, shop_name.length-1); // 給搜索框賦值并搜索 $("#keys").attr("value", data.barcode); $("#search").click(); // 拼接需要語音播報的值 var str = data.goods_name + data.color + data.size_name + '屬于' +shop_str // 調用語音播報的方法 speckText(str); }else { console.log('111') } },error: function (error) { console.log(11) } }); code = ''; lastCode = ''; lastTime = ''; return; } nextTime = new Date().getTime(); if (!lastTime && !lastCode) { code += e.key; } if (lastCode && lastTime && nextTime - lastTime > 30) { // 當掃碼前有keypress事件時,防止首字缺失 code = e.key; } else if (lastCode && lastTime) { code += e.key; } lastCode = nextCode; lastTime = nextTime; } ```