如何实现 canvas 烟花动效

Hi there! To create a firework animation using canvas, you'll need to use JavaScript to draw the shapes and animate them on the canvas. Here's a rough outline of the steps you'll need to follow:

1. Create a canvas element in your HTML and set its width and height.
2. Get a reference to the canvas element in your JavaScript code.
3. Use the canvas API to draw the shapes that will make up your firework. You'll likely want to use the arc() method to draw circles and the fill() method to color them in.
4. Use JavaScript to animate the shapes. You'll need to update the position and size of each shape over time to create the illusion of movement.
5. Add some randomness to your animation to make it look more natural. You could, for example, randomly change the color of each firework or the speed at which it moves.

I hope this helps you get started with creating a canvas firework animation! Let me know if you have any questions.