document.onkeydown = (e)=> {

let nextCode,nextTime = '';

let lastTime = this.lastTime;

let code = this.code;

if (window.event) {// IE

nextCode = e.keyCode

} else if (e.which) {// Netscape/Firefox/Opera

nextCode = e.which

}

nextTime = new Date().getTime();

//字母上方 数字键0-9 对应键码值 48-57; 数字键盘 数字键0-9 对应键码值 96-105

if((nextCode>=48&&nextCode<=57) || (nextCode>=96&&nextCode<=105)){

let codes = {'48':48,'49':49,'50':50,'51':51,'52':52,'53':53,'54':54,'55':55,'56':56,'57':57,

'96':48,'97':49,'98':50,'99':51,'100':52,'101':53,'102':54,'103':55,'104':56,'105':57

};

nextCode = codes[nextCode];

nextTime = new Date().getTime();

}

// 第二次输入延迟两秒，删除之前的数据重新计算

if(nextTime && lastTime && nextTime-lastTime>2000){

code = String.fromCharCode(nextCode);

}else{

code += String.fromCharCode(nextCode)

}

// 保存数据

this.nextCode = nextCode;

this.lastTime = nextTime;

this.code = code;

// 键入Enter

if(e.which == 13) {

// 判断 code 长度（这里就获取到条码值了，以下业务自由发挥）

code = $.trim(code)

if (code.length == 13) {

this.$message('A类条码:' + code);

} else if (code.length == 23) {

this.$message('B类条码:' + code);

} else if (code.length == 0) {

this.$message('请输入条码');

} else{

this.$message('条码不合法：' + code);

}

//键入回车务必清空code值

this.code = ''

return false;

}

}

}  

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