js读取usb扫码枪数据

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<!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>

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