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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <meta name="viewport" content="width=device-width, initial-scale=1.0">
- <title>Document</title>
- <script>
- document.addEventListener('DOMContentLoaded', function(){
- const canvas = document.getElementById("canvasId");
- const context = canvas.getContext("2d");
- context.fillStyle = 'green';
- // context.fillRect(0, 0, 50, 50);
- // context.fillRect(60, 0, 60, 60);
- // context.fillRect(130, 0, 70, 70);
- // context.fillRect(210, 0, 80, 80);
- // context.fillRect(300, 0, 90, 90);
- let x = 0, y = 0, w = 50, h = 50;
- for(let i = 0; i < 5; i++){
- context.fillRect(x, y, w, h);
- w = h = w + 10;
- x = x + w;
- }
- y = 0, w = 50, h = 50, x = canvas.width - w;
- for(let i = 0; i < 5; i++){
- context.fillRect(x, y, w, h);
- x = x - 10;
- w = h = w + 10;
- y = y + h
- }
- w = 50, h = 50, x = canvas.width - w, y = canvas.height - h;
- for(let i = 0; i < 5; i++){
- context.fillRect(x, y, w, h);
- w = h = w + 10;
- y = y - 10;
- x = x - w - 10;
- }
- x = 0, w = 50, h = 50, y = canvas.height - h;
- for(let i = 0; i < 5; i++){
- context.fillRect(x, y, w, h);
- w = h = h + 10;
- y = y - h - 10;
- }
- x = canvas.width/2, y = canvas.height/2, r = 100;
- for(let i = 0; i < 5; i++){
- context.beginPath();
- context.arc(x, y, r, 0, Math.PI*2);
- context.fill();
- context.closePath();
- r = r - 20;
- context.fillStyle = context.fillStyle == '#008000' ? '#FF0000' : '#008000';
- console.log(context.fillStyle);
- }
- });
- </script>
- <style>
- #canvasId{
- background:black;
- }
- </style>
- </head>
- <body>
- <canvas id="canvasId" width="800" height="600"></canvas>
- </body>
- </html>
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