本文主要是介绍javascript读取RFID卡号源码，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
本示例使用的读卡器：Web浏览器JS网页可编程二次开发RFID读卡器Android Linux乐乐课堂-淘宝网 (taobao.com)
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<title>EM_TK4100_ID读卡器DEMO</title><script language="javascript"> var iswsrun = false;var ws;var received_msg = "";var mytimer;var strls = "";var errorno = "";var wsUri = "ws://127.0.0.1:39189"; //端口号必须与RFIDWebServer端口一致 function beep() { //驱动发卡器响声令textarea.value = ""; WebSocketRun("idr_beep,30"); //30为响声时长豪秒，取值范围1-65535}function getdevicenumber() { //读取发卡器唯一出厂序号，可以当加密狗使用 textarea.value = ""; serialnumber.value="";WebSocketRun("IDpcdgetdevicenumber"); } function ReadID() { //卡片在感应区内可以连续读取卡号textarea.value = "";carduid.value=""; Vendorcode.value="";card8h10dz.value="";card8h10df.value="";cardwg26z.value="";cardwg34z.value="";WebSocketRun("idr_read,");} function ReadIDOne() { //卡片进入感应区内只可读取一次卡号，再次读取需将卡片移开再次放入感应区textarea.value = "";carduid.value=""; Vendorcode.value="";card8h10dz.value="";card8h10df.value="";cardwg26z.value="";cardwg34z.value="";WebSocketRun("idr_read_once,");} function DispErrInfo(errcode){var errstr = "";switch (errcode) {case "ReturnCode:008":errstr = "，未寻到卡，请重新将卡放到发卡器的感应区！";break;case "ReturnCode:021":errstr = "，没有动态库！";break;case "ReturnCode:022":errstr = "，动态库或驱动程序异常！";break;case "ReturnCode:023":errstr = "，驱动程序错误或发卡器未连接！";break;case "ReturnCode:024":errstr = "，操作超时，一般是动态库没有反映！";break;case "ReturnCode:025":errstr = "，发送字数不够！";break;case "ReturnCode:026":errstr = "，发送的CRC错！";break;case "ReturnCode:027":errstr = "，接收的字数不够！";break;case "ReturnCode:028":errstr = "，接收的CRC错！";break;case "ReturnCode:029":errstr = "，函数输入参数格式错误！";break;case "ReturnCode:444":errstr = "，RFIDWebServer系统文件错误！";break;default:errstr = "，未知的错误！";}return errstr;} window.onerror = function (e) {alert("不好意思，出错了!");return true;//屏蔽系统事件}function timeoutevent() {ws.close();textarea.value = "websockket返回超时";}//websockket数据处理function WebSocketRev(evt) {clearTimeout(mytimer);received_msg = evt.data;ws.close();//在这里解析返回数据var strlist = received_msg.split(",");if (strlist.length > 1) {var dispstr = "";switch (strlist[0]) {case "idr_beep":dispstr = "函数名称:" + strlist[0] + "\r\n";if (strlist[1] == "ReturnCode:000") {dispstr = dispstr + "操作结果:" + strlist[1];dispstr = dispstr + "，已执行蜂鸣响声操作！\r\n"} else {dispstr = dispstr + "操作结果:" + strlist[1];dispstr = dispstr + DispErrInfo(strlist[1]);}textarea.value = dispstr;break;case "pcdgetdevicenumber":dispstr = "函数名称:" + strlist[0] + "\r\n";if (strlist[1] == "ReturnCode:000") {dispstr = dispstr + "操作结果:" + strlist[1];dispstr = dispstr + "，已读取设备编号！\r\n"serialnumber.value = strlist[2] ;} else {dispstr = dispstr + "操作结果:" + strlist[1];dispstr = dispstr + DispErrInfo(strlist[1]);}textarea.value = dispstr;break;case "idr_read":case "idr_read_once":dispstr = "函数名称:" + strlist[0] + "\r\n";if (strlist[1] == "ReturnCode:000") {dispstr = dispstr + "操作结果:" + strlist[1];dispstr = dispstr + "，已读取卡号！\r\n"} else {dispstr = dispstr + "操作结果:" + strlist[1];dispstr = dispstr + DispErrInfo(strlist[1]);}if (strlist.length > 2) {carduid.value=strlist[2] ;Vendorcode.value=strlist[2].substring(0,2);HLCode=strlist[2].substring(2,4)+strlist[2].substring(4,6)+strlist[2].substring(6,8)+strlist[2].substring(8,10);card8h10dz.value=parseInt("0x"+HLCode).toString().padStart(10, '0');LHCode=strlist[2].substring(8,10)+strlist[2].substring(6,8)+strlist[2].substring(4,6)+strlist[2].substring(2,4);card8h10df.value=parseInt("0x"+LHCode).toString().padStart(10, '0');cardwg26z.value=parseInt("0x"+strlist[2].substring(4,6)).toString().padStart(3, '0')+parseInt("0x"+strlist[2].substring(6,10)).toString().padStart(5, '0');cardwg34z.value=parseInt("0x"+strlist[2].substring(2,6)).toString().padStart(5, '0')+parseInt("0x"+strlist[2].substring(6,10)).toString().padStart(5, '0'); }textarea.value = dispstr;break; }}} function WebSocketRun(sendinfo) {iswsrun = false;try {if ("WebSocket" in window) {ws = new WebSocket(wsUri);}else if ("MozWebSocket" in window) {ws = new MozWebSocket(wsUri);}else {received_msg = "您的浏览器不支持WebSocket，请选用支持WebSocket的浏览器！";return;}clearTimeout(mytimer);ws.onopen = function (evt) {ws.send(sendinfo);iswsrun = true;mytimer = setTimeout("timeoutevent()", 2000);};ws.onmessage = WebSocketRev;ws.onerror = function (e) {if (iswsrun != true) {received_msg = "请先在当前电脑下载>安装>运行我们的服务程序......";window.open("http://www.icmcu.com/ICID15693-02V2test/RFIDWebServerSetup.exe", "top");//打开新窗口alert("请先下载>安装>运行我们的服务程序，再刷新本页面......");}};}catch (ex) {if (iswsrun != true) {received_msg = "请先在当前电脑下载>安装>运行我们的服务程序......";window.open("http://www.icmcu.com/ICID15693-02V2test/RFIDWebServerSetup.exe", "top");//打开新窗口alert("请先下载>安装>运行我们的服务程序，再刷新本页面......");}}}</script>
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<table width="866" height="224" border="1" align="center"><tr><th width="124" height="47" scope="row"><input name="butt_beep" type="submit" id="butt_beep" onclick="beep()" value="驱动发卡器响声" /></th><td width="716"><input name="butt_getdevnum" type="submit" id="butt_getdevnum" onclick="getdevicenumber()" value="读取发卡器唯一出厂序列号" />设备编号：<input name="serialnumber" type="text" id="serialnumber" size="8" maxlength="8" /></td></tr><tr><th height="76" scope="row"><p><input name="butt_idr_read" type="submit" id="butt_idr_read" onclick="ReadID()" value="连续读取ID卡号" /></p><p> </p><p><input name="button" type="submit" id="button" onclick="ReadIDOne()" value="只读一次ID卡号" /></p></th><td><p>原始16进制卡号：<input name="carduid" type="text" id="carduid" size="10" maxlength="10" />，厂商代码：<input name="Vendorcode" type="text" id="Vendorcode" size="2" maxlength="2" /></p><p>转8H10D正码：<input name="card8h10dz" type="text" id="card8h10dz" size="10" maxlength="10" />，转8H10D反码：<input name="card8h10df" type="text" id="card8h10df" size="10" maxlength="10" /></p><p>转WG26正码：<input name="cardwg26z" type="text" id="cardwg26z" size="10" maxlength="10" />
，转WG34正码：
<input name="cardwg34z" type="text" id="cardwg34z" size="10" maxlength="10" /></p></td></tr><tr><th height="78" scope="row"><p>操作提示</p></th><td><textarea name="textarea" id="textarea" cols="100" rows="5" ></textarea></td></tr>
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