js调用串口通信，读取指纹仪数据
参考资料：http://blog.csdn.net/catxl313/article/details/5244243
全部代码如下，此为读取指纹仪：
<!Doctype html>
<html>
<head>
<title></title>
<meta http-equiv=Content-Type content="text/html;charset=utf-8">
<style type="text/css">
body{
text-align: center;
font-size: 12px;
margin: 0px;
padding: 0px;
}
.clear{
margin: 0px 0px 0px 0px;
padding: 0px 0px 0px 0px;
}
.cssCenter{
margin-top: 0px;
margin-bottom: 0px;
margin-left: auto;
margin-right: auto;
}
</style>
<script type="text/javascript">
var ComAxCtrl=null;
function initss(){
document.getElementById("fingerAGM").value = "";
document.getElementById("info").value = "";
var flag = false;
var flag1 = false;
if(ComAxCtrl==null){
flag = true;
}
if(flag){
ComAxCtrl = document.getElementById("ComAxCtrl");
ComAxCtrl.attachEvent("OnCommRecv",OnCommRecv);
flag1 = true;
}else{
if(!ComAxCtrl.IsCommOpen()){
flag1 = true;
}
}
if(flag1){
var result = ComAxCtrl.CommOpen(1,"9600,n,8,1");
if(result==0){
alert("无法找到指纹仪设备！");
return false;
}
}
if(!ComAxCtrl.IsCommOpen()){
alert("指纹仪未打开！");
return false;
}
//发送命令
document.getElementById("info").value="";
var cR = ComAxCtrl.CommSend(stringToHex("TPLT"));
}
function OnCommRecv(data){
hexToString(data);
}
function stringToHex(str){
var val="";
for(var i = 0; i < str.length; i++){
if(val == "")
val = "0X"+str.charCodeAt(i).toString(16);
else
val += ",0X" + str.charCodeAt(i).toString(16);
}
return val;
}
function hexToString(str){
var val="";
var arr = str.split(" ");
for(var i = 0; i<arr.length;i++){
val += String.fromCharCode("0x"+arr[i]);
}
var info = document.getElementById("info").value+val;
document.getElementById("info").value = info;
if(info.length==280){
//接收完数据
}
}
</script>
</head>
<body>
<object id="ComAxCtrl" classid="clsid:1D82E7E4-CDEE-4894-92C2-A3E605D4F84E" codebase="<%=basePath %>ocx/ComAxCtrl.ocx" style="width:1px; height:1px;"></object>
<input type="hidden" id="fingerAGM" value="" />
<button onclick="initss()">读取指纹</button>
<textarea rows="20" cols="50" id="info"></textarea>
</body>
</html>ComAxCtrl.CommOpen(1,"9600,n,8,1")，1表示com口编号。
ComAxCtrl.CommSend();发送命令