功能不起作用-NodeJs-

Question

我有一个问题，我的功能不起作用，我不知道为什么？

我的代码是Nodejs的解释器，用于控制ROBOT前进，后退和跳转。

这是我的代码：

 /*jshint node: true */ "use strict"; var fs = require('fs'); var filename = "./robot.txt"; var command = null ; var x= 0 , y = 0 , r = 90 , j = 0 , n= 0 , le= 0 , ri= 0 , rep = 0 , end = 0, lr= 0 , f = 0 , i= 0 , okC = 0 , b = 0 , t= 0 ; try{ command = fs.readFileSync(filename).toString().split('\\r\\n'); } catch(e){ console.error("I can't read from the file " +e); } var line = []; robotInterpreter(command); console.log('OK' , ' ' + x + ',' + y + ',' + r); function robotInterpreter (value){ for (var i in value) { var okC =0 ; var a = value[i].trim(); line.push(a.split(' ')); for(var j in line){ if(okC === 0) verificationOfCommand(line[i][j]); } if (okC === 1){ if (rep === 0){ var c = a.substring(n).trim().split(','); if(f === 1) verificationOfF(c) ; if(b === 1) VerificationOfB(c) ; if(t === 1) verificationOfT(c) ; if(j === 1) verficationOfJ(c) ; }else{ verificationOfR(c); } } } } function verificationOfE(value){ if(value.length > 1){ console.log('ERROR LINE' + i + ':END has 0 parameters, you wrote' + value.length); } } function verificationOfR(value){ if (value.length > 1) { console.log('ERROR LINE' + i + 'REPEAT has 1 parameters , you wrote' +value.length); }else if(isNaN(value[0])){ console.log('ERROR LINE' + i + 'REPEAT parameter 1 requires a number , you wrote' +value[0]); //}else //if(verificationOfR()) } } function verificationOfComment(value){ var a = value.indexOf('#'); if (a !== (-1)){ console.log(value); } } function verficationOfJ(value){ console.log('YES'); if (value.length > 2 ){ console.log('ERROR LINE' + i + ':JUMP has 2 parameters , you wrote '+value.length); }else if(isNaN(value[0])){ console.log('ERROR LINE' + i + ':JUMP parameter 1 requires a number , you wrote '+value[0]); }else if(isNaN(value[1])){ console.log('ERROR LINE' +i+ ':JUMP parameter 2 requires a number , you wrote' +value[1]); }else { jump(value[0],value[1]); j= 0; } } function verificationOfF(value){ if (value.length > 1){ console.log('ERROR LINE' +i+ ':FORWARD has 1 parameter , you wrote ' + value.length); }else if (isNaN(value[0])){ console.log('ERROR LINE' +i+ ':FORWARD parameter 1 requires a number , you wrote '+ value[0]); }else{ forward(value[0]); f = 0 ; } } function verificationOfT(value){ if (value[0].trim() === "left"){ le = 1 ; } if(value[0].trim() === "right"){ ri= 1; } if (value.length > 2){ console.log('ERROR LINE' +i+ ':TURN has 2 parameters , you wrote '+value.length); }else if(isNaN(value[1])){ console.log('ERROR LINE' +i+ ':TURN parameter 2 requires a number , you wrote'+value[1]); }else if (le === 0 && ri === 0) { console.log('ERROR LINE' +i+ ':TURN parameter requires a left/right , you wrote'+value[0]); }else{ if (le === 1) { turnL(value[1]); t = 0 ; le = 0 ; } if (ri === 1) { turnR(value[1]); t = 0 ; ri= 0 ; } } } function VerificationOfB(value){ if(value.length > 1){ console.log('ERROR LINE'+i+ ':BACKWARD has 1 parameter , you wrote' + value.length); }else if(isNaN(value[0])){ console.log('ERROR LINE' +i+ ':BACKWARD parameter 1 requires a number , you wrote'+value[0]); }else{ backward(value[0]); b = 0; } } function verificationOfCommand(value){ if(value === "FORWARD"){ f = 1 ; okC = 1 ; n = value.length; }else if(value === "BACKWARD"){ b= 1 ; okC = 1 ; n = value.length; }else if (value === "JUMP"){ j = 1 ; okC = 1 ; n = value.length; }else if(value === "TURN"){ t = 1 ; okC = 1 ; n = value.length ; }else if (value === "REPEAT"){ lr = i ; rep = 1 ; n = value.length; }else if(value === "END"){ end = 1 ; n = value.length; } } function forward (value){ x = x + parseInt(value); } function backward (value){ x = x - parseInt(value); } function turnL(value){ var k = parseInt(value); while (k >= 360){ k= k - 360 ; } if (r + k > 360) r = (r+ k) - 360 ; else r = r+ k ; if(r === 360 ) r= 0 ; } function turnR(value){ var k = parseInt(value); while(k >= 360){ k = k - 360 ; } if (r - k < 0 ) r = 360 - (kr); else r = r - k ; if (r === 360) r = 0 ; } function jump(var1, var2){ x = parseInt(var1); y = parseInt(var2); j = 0; } 

robot.txt包含：

# Move
FORWARD 200
COMMAND_WITH_ERROR 
BACKWARD 10

它应该打印：

OK 200, 0, 90
ERROR LINE 2: Unknown command COMMAND_WITH_ERROR
OK 190, 0, 90

但是我的程序只打印：x = 0，y = 0，r = 90

哪里不对了 ？

PS：我使用了jshint，但出现了此错误：

intersting.js: line 39, col 33, 'c' used out of scope.

Answer 1

if (rep === 0){
     var c  =  a.substring(n).trim().split(',');
     ...
     // c is defined here!
     verificationOfR(c);
   } else {
     // c is not defined here!
     verificationOfR(c);
}

在上面的代码中，您没有在else语句中定义c。 在if else语句中，它将采用一条路径或另一条路径，而不是两条路径的任何一条。

您需要执行以下操作

if (rep === 0){
     var c  =  a.substring(n).trim().split(',');
     ...
     verificationOfR(c);
   } else {
     var c  =  a.substring(n).trim().split(',');
     // c is *now* defined here!
     verificationOfR(c);
}