扫码枪扫描二维码，具体内容如下所示：业务需求要将数据生成二维码，并用扫码枪扫出数据上传到服务端。先上代码吧，之后再完善注意点
this.start = new Date().getTime()

let code = ''

let lastTime, nextTime

let lastCode, nextCode

let that = this

window.document.onkeypress = function (e) {

if (window.event) { // IE

nextCode = e.keyCode

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

nextCode = e.which

}

console.time()

console.log('nextCode', nextCode)

if (e.which === 13) {

if (code.length < 3) return // 手动输入的时间不会让code的长度大于2，所以这里只会对扫码枪有

console.log(code)

console.log('扫码结束')

console.timeEnd()

that.parseQRCode(code) // 获取到扫码枪输入的内容，做别的操作

code = ''

lastCode = ''

lastTime = ''

return

}

nextTime = new Date().getTime()

if (!lastTime && !lastCode) {

console.log('扫码开始。。。')

code += e.key

}

if (lastCode && lastTime && nextTime - lastTime > 500) { // 当扫码前有keypress事件时,防止首字缺失

console.log('防止首字缺失。。。')

code = e.key

} else if (lastCode && lastTime) {

console.log('扫码中。。。')

code += e.key

}

lastCode = nextCode

lastTime = nextTime

}
this.start = new Date().getTime()

let code = ''

let lastTime, nextTime

let lastCode, nextCode

let that = this

window.document.onkeypress = function (e) {

if (window.event) { // IE

nextCode = e.keyCode

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

nextCode = e.which

}

console.time()

console.log('nextCode', nextCode)

if (e.which === 13) {

if (code.length < 3) return // 手动输入的时间不会让code的长度大于2，所以这里只会对扫码枪有

console.log(code)

console.log('扫码结束')

console.timeEnd()

that.parseQRCode(code) // 获取到扫码枪输入的内容，做别的操作

code = ''

lastCode = ''

lastTime = ''

return

}

nextTime = new Date().getTime()

if (!lastTime && !lastCode) {

console.log('扫码开始。。。')

code += e.key

}

if (lastCode && lastTime && nextTime - lastTime > 500) { // 当扫码前有keypress事件时,防止首字缺失

console.log('防止首字缺失。。。')

code = e.key

} else if (lastCode && lastTime) {

console.log('扫码中。。。')

code += e.key

}

lastCode = nextCode

lastTime = nextTime

}总结总结总结以上所述是小编给大家介绍的JS实现扫码枪扫描二维码功能，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！
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