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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Canvas拖动方块</title> </head> <body> <canvas id="canvas" width="500" height="500" style="border:1px solid red;"></canvas> <script> const canvas = document.getElementById('canvas'); const ctx = canvas.getContext('2d'); let startX, startY; let isDrawing = false; const rects = []; let selectedSquare = null; let offsetX, offsetY; function findSquare(x, y) { for (let i = rects.length - 1; i >= 0; i--) { const square = rects[i]; if (x >= square.x && x <= square.x + square.w && y >= square.y && y <= square.y + square.h) { return square; } } return null; } canvas.addEventListener('mousedown', (e) => { const mouseX = e.clientX - canvas.getBoundingClientRect().left; const mouseY = e.clientY - canvas.getBoundingClientRect().top; ...
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