一起看看js获取扫码枪输入数据的方法

window.onload = (e)=> {

  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;

    }

  }

}