ReferenceError：变量未定义

变量未定义"/>

ReferenceError：变量未定义

当我想运行下面的代码时，oddsData是未定义的。

getOdds = async(data) => {
    var receivedData = "";
    send({"Command":"GetMatchMarkets","Params":data});
    var message = JSON.stringify({"Command":"GetMatchMarkets","Params":data});
    var length = Buffer.byteLength(message),
    buffer = new Buffer(4 + Buffer.byteLength(message));
    buffer.writeUInt32LE(length, 0);
    buffer.write(message, 4);
    client.write(buffer);
    var bytesToReceive =  length;
    var oddsData = "";
    client.on('data', async(buf) =>  {
        function calc(){
            var offset = 0;
            if (bytesToReceive === 0) { 
                if(buf.length < 4){ return; } 
                bytesToReceive = buf.readUInt32LE(0);
                offset = 4;
            }
            var currentCommandBytes = Math.min(bytesToReceive, buf.length - offset);
            receivedData += buf.slice(offset, offset + currentCommandBytes);
            bytesToReceive -= currentCommandBytes;
            if (bytesToReceive === 0) { 
                bytesToReceive = 0;
                if (receivedData != ""){
                    oddsData += receivedData;
                }
                receivedData = "";
            }
            if (currentCommandBytes < buf.length - offset) {  
                calc(buf.slice(currentCommandBytes+offset))
            }
        }
        var asFun = async (buf) =>  {
            await calc();
        }
    });
    console.log(oddsData);
}

返回ReferenceError：未定义oddsData。

当我想运行下面的代码时，oddsData是未定义的。

[假设您在... OTHER CODES中使用了oddsData，可能是由于这些函数的嵌套引起的，将函数声明为变量，然后将其传递给您的代码。

function test(){

var calc = function (){
     ...OTHER CODES....
     receivedData = "";
     return oddsdata
}

var asFun = async (buf) =>  {
        await calc();
    }
var oddsData = "";
    client.on('data', asFun);
    console.log(oddsData);
}