js读取usb扫码枪数据功能代码实现
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2022-04-15 19:44:44
js读取usb扫码枪数据功能代码实现
js读取usb扫码枪数据功能代码实现
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<meta content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" name="viewport">
</head>
<body class="hold-transition login-page">
<script>
window.onload = function(e){
var code = "";
var lasttime,nexttime;
var lastcode,nextcode;
document.onkeypress = function(e) {
nextcode = e.which;
nexttime = new date().gettime();
if(lastcode != null && lasttime != null && nexttime - lasttime <= 30) {
code += string.fromcharcode(lastcode);
} else if(lastcode != null && lasttime != null && nexttime - lasttime > 100){
code = "";
}
lastcode = nextcode;
lasttime = nexttime;
}
this.onkeypress = function(e){
if(e.which == 13){
console.log(code);
code = "";
}
}
}
</script>
</body>
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