为“虚拟宠物”游戏添加了功能，但我找不到我的错误

Posted 2023-03-10

技术标签:

【中文标题】为“虚拟宠物”游戏添加了功能，但我找不到我的错误【英文标题】：Added features to "Virtual pet" game but I can't find my error 【发布时间】：2019-03-11 14:52:51 【问题描述】：

我刚刚为我的虚拟宠物添加了睡眠和饥饿功能，现在脚本无法运行，我不确定我做错了什么，因为一切看起来都很好。我将向您展示原始脚本（有效）和我修改后的脚本。

我不太确定我错过了什么，我花了相当多的时间来寻找我的错误，任何帮助将不胜感激！

原文：

<!-- Developed @ the University of Advancing Technology for use in UAT courses. -->
<html>
<head>
<title>Virtual Pet</title>
<script>
// Virtual Pet Stats and starting values
// TODO: Change the name of your Virtual Pet on the line below.
var petName = "Virtual Pet";
var currentHealth = 60;
var maxHealth = 100;
var petStatus = "healthy";
// TODO: Add more Virtual Pet stats that will be modified by your functions



// Increases the current health of the Virtual Pet until it is maxed out.
function exercise()

	currentHealth = currentHealth + 5;
	if(currentHealth  > maxHealth)
	
		currentHealth = maxHealth;
	
	
    // Update the display after an action has occurred.
	updateDisplay();


// TODO: Write new functions that will process and modify the new stats you have created. (The majority of your new code should go here.)









// Modifies any stats that automatically change every few seconds. 
//    (For example, health decreases every few seconds so the play needs to occationally exercise their Virtual Pet)
function changesOverTime()

	currentHealth = currentHealth - 4;
	// TODO: Add in other changes to the Virtual Pet stats that occur on a regular basis.
	



// Checks the pet's health and modifies the status accordingly
function checkHealth()

	if(currentHealth <= 0 )
	
		petStatus = "Dead";
        currentHealth = 0;
	
	
	//TODO (Optional): Add other health status checks (For example, sick if health < 15)



// Displays a Title to the screen for your Virtual Pet game
function displayTitle()

	// TODO (Optional): Create your own title
	



// Displays the current pet stats to the screen.
function displayPetStats()

	document.write("<h2>" + petName + " Status: " + petStatus + "</h2>");
	document.write("<p>Health = " + currentHealth + "&nbsp;&nbsp;&nbsp;Max Health = " + maxHealth + "</p>");
	// TODO: Add the display of new Virtual Pet stats here
	
	
	document.close();



// Displays the buttons to the screen enabling the user to interact with their virtual pet.
function displayUserOptions()

	if(petStatus != "Dead")
	
		document.write("<button onclick='exercise()'>Exercise</button>");
		
		// TODO: Create buttons for other actions
		
	



// Calls all the functions that display information to the screen.
function updateDisplay()

	displayTitle();
	displayUserOptions();
	displayPetStats();




// This function executes the game and manages the passing of time.
function gameLoop(timestamp)

	if(timestamp > last_iteration + time_interval)
	
		last_iteration = timestamp;
		
		changesOverTime();
		checkHealth();
		
		// TODO: Check other Virtual Pet stats and update the petStatus accordingly
        
        
        
        
        // After all stats updates are done, update/recreate the display
        updateDisplay();
	
	
	
	
	// Life continues unless the Virtual Pet is dead (health <= 0)
	if(petStatus != "Dead")
	
        // Executes the gameLoop function once again.
		requestAnimationFrame(gameLoop);
	


// Other global variables that control the timing of the game.
var time_interval = 5000;
var last_iteration = 0;
</script>
</head>

<body>
<h1>My Virtual Pet!</h1>
<!-- Initiate the gameLoop for the first time.-->
<button onclick='gameLoop()'>Bring my Virtual Pet to Life!</button>
</body>
</html>

我修改后的脚本：

<!-- Developed @ the University of Advancing Technology for use in UAT courses. -->
<html>
<head>
<title>Virtual Pet</title>
<script>
// Virtual Pet Stats and starting values
// TODO: Change the name of your Virtual Pet on the line below.
var petName = "Virtual Pet";
var currentHealth = 60;
var maxHealth = 100;
var petStatus = "healthy";
var tiredness = 60;
var maxTiredness = 100;
var hunger = 60;
var maxHunger = 100;
// TODO: Add more Virtual Pet stats that will be modified by your functions



// Increases the current health of the Virtual Pet until it is maxed out.
function exercise()

	currentHealth = currentHealth + 5;
	if(currentHealth  > maxHealth)
	
		currentHealth = maxHealth;
	
	
    // Update the display after an action has occurred.
	updateDisplay();


function sleep()
	var sleepamount = prompt("How many minutes would you like to sleep?");
	tiredness + sleepamount = tiredness;
	if tiredness >= 100 
	tiredness = 100;
	
    // Update the display after an action has occurred.
	updateDisplay();

function checkHunger()
	var feed = prompt("How many snacks do you want to eat?");
	hunger + feed = hunger;
	if hunger >= 100 
	hunger = 100;

    // Update the display after an action has occurred.
	updateDisplay();


// TODO: Write new functions that will process and modify the new stats you have created. (The majority of your new code should go here.)









// Modifies any stats that automatically change every few seconds. 
//    (For example, health decreases every few seconds so the play needs to occationally exercise their Virtual Pet)
function changesOverTime()

	currentHealth = currentHealth - 4;
	tiredness = tiredness - 4;
	hunger = hunger - 4;
	// TODO: Add in other changes to the Virtual Pet stats that occur on a regular basis.
	



// Checks the pet's health and modifies the status accordingly
function checkHealth()

	if(currentHealth <= 0 )
	
		petStatus = "Dead";
        currentHealth = 0;
	
	
	//TODO (Optional): Add other health status checks (For example, sick if health < 15)

function checkStarved()

	if(hunger <= 0 )
		petStatus = "Dead";
        hunger = 0;
	 else if hunger >= 30 && hunger <= 75 
		petStatus = "Hungry";
	
	
	//TODO (Optional): Add other health status checks (For example, sick if health < 15)
	



// Displays a Title to the screen for your Virtual Pet game
function displayTitle()

	// TODO (Optional): Create your own title
	



// Displays the current pet stats to the screen.
function displayPetStats()

	document.write("<h2>" + petName + " Status: " + petStatus + "</h2>");
	document.write("<p>Health = " + currentHealth + "&nbsp;&nbsp;&nbsp;Max Health = " + maxHealth + "</p>");
	document.write("<p>Hunger = " + hunger + "&nbsp;&nbsp;&nbsp;Max Hunger = " + maxHunger + "</p>");
	document.write("<p>Tiredness = " + tiredness + "&nbsp;&nbsp;&nbsp;Max Tiredness = " + maxTiredness + "</p>");
	// TODO: Add the display of new Virtual Pet stats here
	
	
	document.close();



// Displays the buttons to the screen enabling the user to interact with their virtual pet.
function displayUserOptions()

	if(petStatus != "Dead")
	
		document.write("<button onclick='exercise()'>Exercise</button>");
		document.write("<button onclick='sleep()'>Sleep</button>");
		document.write("<button onclick='checkHunger()'>Feed</button>");
		
		// TODO: Create buttons for other actions
		
	



// Calls all the functions that display information to the screen.
function updateDisplay()

	displayTitle();
	displayUserOptions();
	displayPetStats();




// This function executes the game and manages the passing of time.
function gameLoop(timestamp)

	if(timestamp > last_iteration + time_interval)
	
		last_iteration = timestamp;
		
		changesOverTime();
		checkHealth();
		checkStarved()
		
		// TODO: Check other Virtual Pet stats and update the petStatus accordingly
        
        
        
        
        // After all stats updates are done, update/recreate the display
        updateDisplay();
	
	
	
	
	// Life continues unless the Virtual Pet is dead (health <= 0)
	if(petStatus != "Dead")
	
        // Executes the gameLoop function once again.
		requestAnimationFrame(gameLoop);
	


// Other global variables that control the timing of the game.
var time_interval = 5000;
var last_iteration = 0;
</script>
</head>

<body>
<h1>My Virtual Pet!</h1>
<!-- Initiate the gameLoop for the first time.-->
<button onclick='gameLoop()'>Bring my Virtual Pet to Life!</button>
</body>
</html>

【问题讨论】：

此hunger + feed = hunger; 无效。你肯定是说hunger += feed; 很好，我确实改变了饥饿+饲料=饥饿喂+=饥饿我也将疲劳度 + sleepamount = 疲劳度更改为 sleepamount += 疲劳度，但它仍然无法运行 【参考方案1】：

您多次出现两个错误。

分配变量声明需要在 = 符号的左侧，疲倦 + 饥饿 = 饥饿需要是饥饿 = 疲倦 + 饥饿

if语句缺失()，如果饥饿>0需要为if(饥饿>0)

这是一个更新的脚本。

<!-- Developed @ the University of Advancing Technology for use in UAT courses. -->
<html>
<head>
<title>Virtual Pet</title>
<script>
// Virtual Pet Stats and starting values
// TODO: Change the name of your Virtual Pet on the line below.
var petName = "Virtual Pet";
var currentHealth = 60;
var maxHealth = 100;
var petStatus = "healthy";
var tiredness = 60;
var maxTiredness = 100;
var hunger = 60;
var maxHunger = 100;
// TODO: Add more Virtual Pet stats that will be modified by your functions



// Increases the current health of the Virtual Pet until it is maxed out.
function exercise()

	currentHealth = currentHealth + 5;
	if(currentHealth  > maxHealth)
	
		currentHealth = maxHealth;
	
	
    // Update the display after an action has occurred.
	updateDisplay();


function sleep()
	var sleepamount = prompt("How many minutes would you like to sleep?");
	tiredness = sleepamount + tiredness;
	if (tiredness >= 100) 
	tiredness = 100;
	
    // Update the display after an action has occurred.
	updateDisplay();

function checkHunger()
	var feed = prompt("How many snacks do you want to eat?");
	hunger = feed + hunger;
	if (hunger >= 100) 
	hunger = 100;

    // Update the display after an action has occurred.
	updateDisplay();


// TODO: Write new functions that will process and modify the new stats you have created. (The majority of your new code should go here.)









// Modifies any stats that automatically change every few seconds. 
//    (For example, health decreases every few seconds so the play needs to occationally exercise their Virtual Pet)
function changesOverTime()

	currentHealth = currentHealth - 4;
	tiredness = tiredness - 4;
	hunger = hunger - 4;
	// TODO: Add in other changes to the Virtual Pet stats that occur on a regular basis.
	



// Checks the pet's health and modifies the status accordingly
function checkHealth()

	if(currentHealth <= 0 )
	
		petStatus = "Dead";
        currentHealth = 0;
	
	
	//TODO (Optional): Add other health status checks (For example, sick if health < 15)

function checkStarved()

	if(hunger <= 0 )
		petStatus = "Dead";
        hunger = 0;
	 else if (hunger >= 30 && hunger <= 75) 
		petStatus = "Hungry";
	
	
	//TODO (Optional): Add other health status checks (For example, sick if health < 15)
	



// Displays a Title to the screen for your Virtual Pet game
function displayTitle()

	// TODO (Optional): Create your own title
	



// Displays the current pet stats to the screen.
function displayPetStats()

	document.write("<h2>" + petName + " Status: " + petStatus + "</h2>");
	document.write("<p>Health = " + currentHealth + "&nbsp;&nbsp;&nbsp;Max Health = " + maxHealth + "</p>");
	document.write("<p>Hunger = " + hunger + "&nbsp;&nbsp;&nbsp;Max Hunger = " + maxHunger + "</p>");
	document.write("<p>Tiredness = " + tiredness + "&nbsp;&nbsp;&nbsp;Max Tiredness = " + maxTiredness + "</p>");
	// TODO: Add the display of new Virtual Pet stats here
	
	
	document.close();



// Displays the buttons to the screen enabling the user to interact with their virtual pet.
function displayUserOptions()

	if(petStatus != "Dead")
	
		document.write("<button onclick='exercise()'>Exercise</button>");
		document.write("<button onclick='sleep()'>Sleep</button>");
		document.write("<button onclick='checkHunger()'>Feed</button>");
		
		// TODO: Create buttons for other actions
		
	



// Calls all the functions that display information to the screen.
function updateDisplay()

	displayTitle();
	displayUserOptions();
	displayPetStats();




// This function executes the game and manages the passing of time.
function gameLoop(timestamp)

	if(timestamp > last_iteration + time_interval)
	
		last_iteration = timestamp;
		
		changesOverTime();
		checkHealth();
		checkStarved()
		
		// TODO: Check other Virtual Pet stats and update the petStatus accordingly
        
        
        
        
        // After all stats updates are done, update/recreate the display
        updateDisplay();
	
	
	
	
	// Life continues unless the Virtual Pet is dead (health <= 0)
	if(petStatus != "Dead")
	
        // Executes the gameLoop function once again.
		requestAnimationFrame(gameLoop);
	


// Other global variables that control the timing of the game.
var time_interval = 5000;
var last_iteration = 0;
</script>
</head>

<body>
<h1>My Virtual Pet!</h1>
<!-- Initiate the gameLoop for the first time.-->
<button onclick='gameLoop()'>Bring my Virtual Pet to Life!</button>
</body>
</html>

【讨论】：

谢谢你，我很高兴得知变量需要在左侧，这就是破坏我的代码的原因！也感谢您对我的错误的其他回答。【参考方案2】：

代码中有两处错误：

= 的左侧必须是变量。您正在使用 tiredness + sleepamount = tiredness 这是一些地方。将其更改为tiredness = tiredness + sleepamount if 的条件应该在() 中，但您使用的是这样的hunger >= 100

<!-- Developed @ the University of Advancing Technology for use in UAT courses. -->
<html>
<head>
<title>Virtual Pet</title>
<script>
// Virtual Pet Stats and starting values
// TODO: Change the name of your Virtual Pet on the line below.
var petName = "Virtual Pet";
var currentHealth = 60;
var maxHealth = 100;
var petStatus = "healthy";
var tiredness = 60;
var maxTiredness = 100;
var hunger = 60;
var maxHunger = 100;
// TODO: Add more Virtual Pet stats that will be modified by your functions
// Increases the current health of the Virtual Pet until it is maxed out.
function exercise()

	currentHealth = currentHealth + 5;
	if(currentHealth  > maxHealth)
	
		currentHealth = maxHealth;
	   	
    // Update the display after an action has occurred.
	updateDisplay();


function sleep()
	var sleepamount = prompt("How many minutes would you like to sleep?");
	tiredness = tiredness + sleepamount;
	if (tiredness >= 100) 
	   tiredness = 100;
	
    // Update the display after an action has occurred.
	updateDisplay();

function checkHunger()
	var feed = prompt("How many snacks do you want to eat?");
	hunger = hunger + feed;
	if (hunger >= 100) 
	hunger = 100;

    // Update the display after an action has occurred.
	updateDisplay();


// TODO: Write new functions that will process and modify the new stats you have created. (The majority of your new code should go here.)

// Modifies any stats that automatically change every few seconds. 
//    (For example, health decreases every few seconds so the play needs to occationally exercise their Virtual Pet)
function changesOverTime()

	currentHealth = currentHealth - 4;
	tiredness = tiredness - 4;
	hunger = hunger - 4;
	// TODO: Add in other changes to the Virtual Pet stats that occur on a regular basis.  	

// Checks the pet's health and modifies the status accordingly
function checkHealth()

	if(currentHealth <= 0 )
	
		petStatus = "Dead";
        currentHealth = 0;
	    	
	//TODO (Optional): Add other health status checks (For example, sick if health < 15)

function checkStarved()

	if(hunger <= 0 )
		petStatus = "Dead";
        hunger = 0;
	 else if (hunger >= 30 && hunger <= 75) 
		petStatus = "Hungry";
	
	
	//TODO (Optional): Add other health status checks (For example, sick if health < 15)
	

// Displays a Title to the screen for your Virtual Pet game
function displayTitle()

	// TODO (Optional): Create your own title
	

// Displays the current pet stats to the screen.
function displayPetStats()

	document.write("<h2>" + petName + " Status: " + petStatus + "</h2>");
	document.write("<p>Health = " + currentHealth + "&nbsp;&nbsp;&nbsp;Max Health = " + maxHealth + "</p>");
	document.write("<p>Hunger = " + hunger + "&nbsp;&nbsp;&nbsp;Max Hunger = " + maxHunger + "</p>");
	document.write("<p>Tiredness = " + tiredness + "&nbsp;&nbsp;&nbsp;Max Tiredness = " + maxTiredness + "</p>");
	// TODO: Add the display of new Virtual Pet stats here    	
	document.close();

// Displays the buttons to the screen enabling the user to interact with their virtual pet.
function displayUserOptions()

	if(petStatus != "Dead")
	
		document.write("<button onclick='exercise()'>Exercise</button>");
		document.write("<button onclick='sleep()'>Sleep</button>");
		document.write("<button onclick='checkHunger()'>Feed</button>");
		
		// TODO: Create buttons for other actions
		
	

// Calls all the functions that display information to the screen.
function updateDisplay()

	displayTitle();
	displayUserOptions();
	displayPetStats();


// This function executes the game and manages the passing of time.
function gameLoop(timestamp)

	if(timestamp > last_iteration + time_interval)
	
		last_iteration = timestamp;
		
		changesOverTime();
		checkHealth();
		checkStarved()		
		// TODO: Check other Virtual Pet stats and update the petStatus accordingly                                    
        // After all stats updates are done, update/recreate the display
        updateDisplay();
	
	// Life continues unless the Virtual Pet is dead (health <= 0)
	if(petStatus != "Dead")
	
        // Executes the gameLoop function once again.
		requestAnimationFrame(gameLoop);
	

// Other global variables that control the timing of the game.
var time_interval = 5000;
var last_iteration = 0;
</script>
</head>
<body>
<h1>My Virtual Pet!</h1>
<!-- Initiate the gameLoop for the first time.-->
<button onclick='gameLoop()'>Bring my Virtual Pet to Life!</button>
</body>
</html>

【讨论】：

谢谢，我很欣赏关于将变量放在 = 符号左侧以及何时使用 () 的重要课程！

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