js读取usb扫码枪数据

株野 2018-07-19

展开全文

2017年12月21日 15:15:31

标签：javascript USB 扫描枪

来源：https://blog.csdn.net/wjy199506/article/details/78864091

<!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>
</html>