# 获取打印组件版本号
发送指令给打印组件，获取打印组件的版本号
# 请求示例
const ws = new WebSocket('ws://127.0.0.1:12705');
ws.onopen = () => {
console.log('与打印组件建立连接成功: ');
ws.send(JSON.stringify({
requestID: '1234',
command: 'getAppInfo'
}))
};
ws.onmessage = (e) => {
const resp = JSON.parse(e.data || '{}')
if (resp.command === 'getAppInfo') {
console.log('打印组件版本信息: ', resp);
}
};
# 返回参数示例
{
"command": "getAppInfo",
"requestID": "1234",
"appInfo": {
"version": "1.3.4",
},
}