如果语句卡在循环中，如何只运行一次

Question

我正在创建一个系统，每次温度传感器超出极限时都会发送文本。我只需要发送一次此文本，但它一直在发送。

法典：

if(temp > (userTemp + 5.00))
    {
        ledState2=1;
        device.send("led2", ledState2);
        local smsState = 0; //State, if sms has been sent yet or not
        if(smsState==0)
        {
            smsState=1;
            //This is where the sms script will be put
            server.log("SMS should send: " + smsState);         
        }
    }

输出：

2014-11-20 10:12:58 UTC+0   [Device]    Set RED LED: 1
2014-11-20 10:13:08 UTC+0   [Device]    22.3245
2014-11-20 10:13:08 UTC+0   [Agent] SMS should send: 1
2014-11-20 10:13:09 UTC+0   [Device]    Set RED LED: 1
2014-11-20 10:13:18 UTC+0   [Device]    22.2814
2014-11-20 10:13:18 UTC+0   [Agent] SMS should send: 1
2014-11-20 10:13:19 UTC+0   [Device]    Set RED LED: 1
2014-11-20 10:13:28 UTC+0   [Device]    22.3245
2014-11-20 10:13:28 UTC+0   [Agent] SMS should send: 1
2014-11-20 10:13:29 UTC+0   [Device]    Set RED LED: 1
2014-11-20 10:13:38 UTC+0   [Device]    22.2814
2014-11-20 10:13:39 UTC+0   [Agent] SMS should send: 1
2014-11-20 10:13:39 UTC+0   [Device]    Set RED LED: 1
2014-11-20 10:13:48 UTC+0   [Device]    22.3245
2014-11-20 10:13:49 UTC+0   [Agent] SMS should send: 1
2014-11-20 10:13:49 UTC+0   [Device]    Set RED LED: 1
2014-11-20 10:13:58 UTC+0   [Device]    22.2814
2014-11-20 10:13:59 UTC+0   [Agent] SMS should send: 1
2014-11-20 10:13:59 UTC+0   [Device]    Set RED LED: 1
2014-11-20 10:14:08 UTC+0   [Device]    22.3029
2014-11-20 10:14:09 UTC+0   [Agent] SMS should send: 1

我不明白为什么会继续发送服务器.log当我输入应该只运行一次的 smsState if 语句时，因为我将 smsState 更改为 1这是在电动小鬼上，如果这改变了什么，但我认为它不会

Answer 1

这很简单，真的。只需添加一个变量来跟踪语句是否已运行。

local didSend = 0;
if(temp > (userTemp + 5.00) && !didSend)
{
    didSend = 1;
    ledState2=1;
    device.send("led2", ledState2);
    local smsState = 0; //State, if sms has been sent yet or not
    if(smsState==0)
    {
        smsState=1;
        //This is where the sms script will be put
        server.log("SMS should send: " + smsState);         
    }
}

现在，if 语句将不会再次运行，直到您再次将 didSend 更改回 0。