首页 >> js开发 >> js代码使用JavaScript获取扫码枪扫描得到的条形码的思路代码详解
js代码使用JavaScript获取扫码枪扫描得到的条形码的思路代码详解
发布时间: 2021年1月13日 | 浏览:
| 分类:js开发
下面通过实例代码给大家介绍js扫码枪扫描条形码的实现方法，具体代码如下所示：
var keycode = "";
var lastTime=null,nextTime;
var lastCode=null,nextCode;
document.οnkeydοwn=function(e){
if(window.event){
// IE
nextCode = e.keyCode
} else if(e.which){
// Netscape/Firefox/Opera
nextCode = e.which
}
//+键，增加新数据行
if(nextCode==107 || nextCode==187){
addNewGoodLine();
}
//-键，删除最后一条数据行
else if(nextCode==109 || nextCode==189){
$(".new_products:last").remove();
}
//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
else if((nextCode>=48&&nextCode<=57) || (nextCode>=96&&nextCode<=105)){
//数字键盘的键码值对应的字符有问题，所以手动调整键码值
var 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();
if(lastCode == null && lastTime == null) {
keycode = String.fromCharCode(nextCode);
} else if(lastCode != null && lastTime != null && nextTime - lastTime <= 30) {
keycode += String.fromCharCode(nextCode);
} else{
keycode = "";
lastCode = null;
lastTime = null;
}
lastCode = nextCode;
lastTime = nextTime;
}
//13 为按键Enter
else if(nextCode==13 && keycode!= ""){
var code = $(".new_products:last .code").val();
if(code != ""){
//最后一行已录入数据，重新生成新行
addNewGoodLine();
}
$(".new_products:last .code").val(keycode).blur();
keycode = "";
lastCode = null;
lastTime = null;
}
}
function addNewGoodLine(){
//生成新数据行
var html = '';
html += '
html += '
';
html += '
';
html += '
';
html += ' ';
}
function getProductDetail(){
//获取商品的详细信息，然后赋值
}
var keycode = "";
var lastTime=null,nextTime;
var lastCode=null,nextCode;
document.οnkeydοwn=function(e){
if(window.event){
// IE
nextCode = e.keyCode
} else if(e.which){
// Netscape/Firefox/Opera
nextCode = e.which
}
//+键，增加新数据行
if(nextCode==107 || nextCode==187){
addNewGoodLine();
}
//-键，删除最后一条数据行
else if(nextCode==109 || nextCode==189){
$(".new_products:last").remove();
}
//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
else if((nextCode>=48&&nextCode<=57) || (nextCode>=96&&nextCode<=105)){
//数字键盘的键码值对应的字符有问题，所以手动调整键码值
var 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();
if(lastCode == null && lastTime == null) {
keycode = String.fromCharCode(nextCode);
} else if(lastCode != null && lastTime != null && nextTime - lastTime <= 30) {
keycode += String.fromCharCode(nextCode);
} else{
keycode = "";
lastCode = null;
lastTime = null;
}
lastCode = nextCode;
lastTime = nextTime;
}
//13 为按键Enter
else if(nextCode==13 && keycode!= ""){
var code = $(".new_products:last .code").val();
if(code != ""){
//最后一行已录入数据，重新生成新行
addNewGoodLine();
}
$(".new_products:last .code").val(keycode).blur();
keycode = "";
lastCode = null;
lastTime = null;
}
}
function addNewGoodLine(){
//生成新数据行
var html = '';
html += '
html += '
';
html += '
';
html += '
';
html += ' ';
}
function getProductDetail(){
//获取商品的详细信息，然后赋值
}思路： 思路： 思路： 1.注册onkeydown事件，捕获数字键的按下事件2.计算按下数字键的时间间隔，若间隔小于30毫秒，则为扫码枪输入3.捕获Enter案件的按下事件，判断捕获的扫码枪输入数值是否为空，不为空，对相应的文本框赋值，同时触发按找条形码查找商品的方法总结总结总结
var keycode = "";
var lastTime=null,nextTime;
var lastCode=null,nextCode;
document.οnkeydοwn=function(e){
if(window.event){
// IE
nextCode = e.keyCode
} else if(e.which){
// Netscape/Firefox/Opera
nextCode = e.which
}
//+键，增加新数据行
if(nextCode==107 || nextCode==187){
addNewGoodLine();
}
//-键，删除最后一条数据行
else if(nextCode==109 || nextCode==189){
$(".new_products:last").remove();
}
//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
else if((nextCode>=48&&nextCode<=57) || (nextCode>=96&&nextCode<=105)){
//数字键盘的键码值对应的字符有问题，所以手动调整键码值
var 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();
if(lastCode == null && lastTime == null) {
keycode = String.fromCharCode(nextCode);
} else if(lastCode != null && lastTime != null && nextTime - lastTime <= 30) {
keycode += String.fromCharCode(nextCode);
} else{
keycode = "";
lastCode = null;
lastTime = null;
}
lastCode = nextCode;
lastTime = nextTime;
}
//13 为按键Enter
else if(nextCode==13 && keycode!= ""){
var code = $(".new_products:last .code").val();
if(code != ""){
//最后一行已录入数据，重新生成新行
addNewGoodLine();
}
$(".new_products:last .code").val(keycode).blur();
keycode = "";
lastCode = null;
lastTime = null;
}
}
function addNewGoodLine(){
//生成新数据行
var html = '
html += '
html += '
html += '
';
html += '
html += '
}
function getProductDetail(){
//获取商品的详细信息，然后赋值
}
var keycode = "";
var lastTime=null,nextTime;
var lastCode=null,nextCode;
document.οnkeydοwn=function(e){
if(window.event){
// IE
nextCode = e.keyCode
} else if(e.which){
// Netscape/Firefox/Opera
nextCode = e.which
}
//+键，增加新数据行
if(nextCode==107 || nextCode==187){
addNewGoodLine();
}
//-键，删除最后一条数据行
else if(nextCode==109 || nextCode==189){
$(".new_products:last").remove();
}
//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
else if((nextCode>=48&&nextCode<=57) || (nextCode>=96&&nextCode<=105)){
//数字键盘的键码值对应的字符有问题，所以手动调整键码值
var 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();
if(lastCode == null && lastTime == null) {
keycode = String.fromCharCode(nextCode);
} else if(lastCode != null && lastTime != null && nextTime - lastTime <= 30) {
keycode += String.fromCharCode(nextCode);
} else{
keycode = "";
lastCode = null;
lastTime = null;
}
lastCode = nextCode;
lastTime = nextTime;
}
//13 为按键Enter
else if(nextCode==13 && keycode!= ""){
var code = $(".new_products:last .code").val();
if(code != ""){
//最后一行已录入数据，重新生成新行
addNewGoodLine();
}
$(".new_products:last .code").val(keycode).blur();
keycode = "";
lastCode = null;
lastTime = null;
}
}
function addNewGoodLine(){
//生成新数据行
var html = '
html += '
html += '
html += '
';
html += '
html += '
}
function getProductDetail(){
//获取商品的详细信息，然后赋值
}思路： 思路： 思路： 1.注册onkeydown事件，捕获数字键的按下事件2.计算按下数字键的时间间隔，若间隔小于30毫秒，则为扫码枪输入3.捕获Enter案件的按下事件，判断捕获的扫码枪输入数值是否为空，不为空，对相应的文本框赋值，同时触发按找条形码查找商品的方法总结总结总结
相关文章:
- jsElement Input输入框的使用方法js大全
- js解决vue页面渲染但dom没渲染的操作js大全
- js谈一谈vue请求数据放在created好还是mounted里好js大全
- js解决vue的router组件component在import时不能使用变量问题js大全
- js在vue中使用防抖函数组件操作js大全
- jsVue中的this.$options.data()和this.$data用法说明js大全
- jsElement Breadcrumb 面包屑的使用方法js大全
- js解决vue动态路由异步加载import组件,加载不到module的问题js大全
- jsAngular利用HTTP POST下载流文件的步骤记录js大全
- js解决vuex数据页面刷新后初始化操作js大全
刚刚发布热门点击发布时间
- [07/09]Chrome抓取页面内容代码|chrome插件获取页面数据
- [07/09]谷歌浏览器数据采集插件开发|谷歌浏览器的采集功能
- [07/09]Chrome插件轻松抓取网络数据,Chrome插件轻松抓取网页源码数据
- [07/09]chrome插件怎么安装?chrome插件开发如何安装chrome插件
- [07/09]快速chrome插件开发-北京chrome插件开发外包
- [12/31]清大光德落地护眼灯|清大光德儿童护眼灯
- [07/20]网站无障碍适老化外包改造私有化过程遇到问题整理
- [07/19]适老化改造工信部明确APP适老化规范：禁广告弹窗，网站需提供特大字体
- [07/19]适老化改造包括哪些方面?
- [07/19]什么是适老化改造？
- [07/19]适老化与信息无障碍是什么关系，二者有何异同？
- [07/19]网站如何进行适老化改造？
- [07/12]老年群体面临“数字鸿沟” 数字化网站适老化改造服务彰显人文关怀
- [07/12]数字适老化改造方案 老龄群体数字化改造受关注
- [07/11]什么是重绘?什么是回流?常见引起回流属性和方法：
