1、掃碼槍相當(dāng)于鍵盤輸入設(shè)備，輸入一連串?dāng)?shù)字后加一個(gè)enter鍵。但在實(shí)際開發(fā)中需要區(qū)分是掃描槍輸入還是鍵盤用戶輸入，區(qū)別在于掃碼槍輸入很快。

let code = ’’; let lastTime, nextTime; let lastCode, nextCode; window.document.onkeypress = (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(dòng)輸入的時(shí)間不會(huì)讓code的長(zhǎng)度大于2，所以這里只會(huì)對(duì)掃碼槍有 console.log(code); // 獲取到掃碼槍輸入的內(nèi)容，做別的操作 code = ’’; lastCode = ’’; lastTime = ’’; return; } nextTime = new Date().getTime(); if (!lastTime && !lastCode) { code += e.key; } if (lastCode && lastTime && nextTime - lastTime > 30) { // 當(dāng)掃碼前有keypress事件時(shí),防止首字缺失 code = e.key; } else if (lastCode && lastTime) { code += e.key; } lastCode = nextCode; lastTime = nextTime; }

PS：下面看下js獲取USB掃碼槍數(shù)據(jù)的代碼

前言

找了很多相關(guān)的教程不太好用，汲取各家之長(zhǎng)總結(jié)精簡(jiǎn)了一下

原理

掃碼槍掃描到的條形碼每一位會(huì)觸發(fā)一次onkeydown事件 比如掃描條碼位‘1234567890’的條形碼，會(huì)連續(xù)執(zhí)行10次onkeydown事件 條碼掃描到最后一位，會(huì)直接觸發(fā)Enter

需要引入jQuery，我這里用的是vue

window.onload = (e)=> { document.onkeydown = (e)=> { let nextCode,nextTime = ’’; let lastTime = this.lastTime; let code = this.code; if (window.event) {// IE nextCode = e.keyCode } else if (e.which) {// Netscape/Firefox/Opera nextCode = e.which } nextTime = new Date().getTime(); //字母上方 數(shù)字鍵0-9 對(duì)應(yīng)鍵碼值 48-57; 數(shù)字鍵盤 數(shù)字鍵0-9 對(duì)應(yīng)鍵碼值 96-105 if((nextCode>=48&&nextCode<=57) || (nextCode>=96&&nextCode<=105)){ let codes = {’48’:48,’49’:49,’50’:50,’51’:51,’52’:52,’53’:53,’54’:54,’55’:55,’56’:56,’57’:57, ’96’:48,’97’:49,’98’:50,’99’:51,’100’:52,’101’:53,’102’:54,’103’:55,’104’:56,’105’:57};nextCode = codes[nextCode];nextTime = new Date().getTime(); } // 第二次輸入延遲兩秒，刪除之前的數(shù)據(jù)重新計(jì)算 if(nextTime && lastTime && nextTime-lastTime>2000){code = String.fromCharCode(nextCode); }else{ code += String.fromCharCode(nextCode) } // 保存數(shù)據(jù) this.nextCode = nextCode; this.lastTime = nextTime; this.code = code; // 鍵入Enter if(e.which == 13) { // 判斷 code 長(zhǎng)度（這里就獲取到條碼值了，以下業(yè)務(wù)自由發(fā)揮） code = $.trim(code) if (code.length == 13) {this.$message(’A類條碼:’ + code); } else if (code.length == 23) {this.$message(’B類條碼:’ + code); } else if (code.length == 0) {this.$message(’請(qǐng)輸入條碼’); } else{ this.$message(’條碼不合法：’ + code); } //鍵入回車務(wù)必清空code值 this.code = ’’ return false; } }}

總結(jié)

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