Hey Nick, let's work through these two tricky issues you're facing—they're super common when starting out with HTML5 game dev, so you're not alone!

1. Right-Click Movement Only Works Once #

First up, the right-click problem. The most likely culprit here is the default browser right-click menu interfering with your event handling. When you right-click, the browser pops up its own menu by default, which can disrupt subsequent event triggers. Here's how to fix that:

• In your right-click event handler, add event.preventDefault() to block the default menu. This ensures your code is the only thing responding to the right-click.
• Double-check how you're binding the event. If you used something like player.oncontextmenu = function() { ... }, make sure this isn't being overwritten elsewhere in your code. Using player.addEventListener('contextmenu', yourHandler) is more reliable for persistent event listening.
• If your player element gets recreated or replaced during gameplay (unlikely if you're just moving it), you'd need to reattach the event listener after recreating it. But for simple position changes, this shouldn't be necessary.

2. Timer Only Runs Once + xNum/yNum Stuck at 0 #

This sounds like a combination of timer type confusion and variable scope issues:

• Timer type: If you used setTimeout() instead of setInterval(), your function will only run once. setTimeout executes code after a delay, while setInterval repeats it at the specified interval. Alternatively, you can use setTimeout recursively by calling it again at the end of your function to create a loop.
• Variable scope: If xNum and yNum are declared inside the function your timer calls, they'll reset to 0 every time the function runs. Move these declarations outside the function (to the global scope, or inside a closure if you want to avoid globals) so their values persist between calls.
• Log placement: Make sure you're logging xNum and yNum after you've updated them in your function. If you log before modifying them, you'll always see the initial 0 value.

Quick Example Code to Fix Both Issues #

Here's a simplified snippet that addresses both problems:

// Keep these variables outside the function so their values persist
let xNum = 0;
let yNum = 0;
const player = document.getElementById('player');

// Handle right-click movement
player.addEventListener('contextmenu', (e) => {
  e.preventDefault(); // Block default right-click menu
  // Update position on right-click
  xNum += 50;
  player.style.left = `${xNum}px`;
  console.log('Right-click moved player to x:', xNum);
});

// Recurring update function using setTimeout
function gameLoop() {
  // Update y position continuously
  yNum += 10;
  player.style.top = `${yNum}px`;
  console.log('Current position: x=', xNum, 'y=', yNum);
  
  // Call the loop again after 1 second
  setTimeout(gameLoop, 1000);
}

// Start the game loop
gameLoop();

Give these fixes a try—start with blocking the default right-click menu and checking your variable scope first, since those are the most likely fixes. Let me know if you run into more snags!

内容的提问来源于stack exchange，提问作者Nick