Question

我有问题，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向前，向后和向前移动跳。

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 - (k-r); 
	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

但我的程序只打印：x = 0，y = 0，r = 90

有什么不对吗？

PS：我使用了jshint，我收到了这个错误：

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，你没有在else语句中定义c。在if else语句中，它将采用一个或另一个路径，而不是两个路径。

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);
}

功能不起作用 - NodeJs -

1 个答案: