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HTML canvas putImageData() 方法
tryhtml5_canvas_putimagedata
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<!DOCTYPE html> <html> <body> <h1>HTML5 Canvas</h1> <h2>The putImageData() Method</h2> <canvas id="myCanvas" width="300" height="150" style="border:1px solid grey"></canvas> <script> const c = document.getElementById("myCanvas"); const ctx = c.getContext("2d"); ctx.fillStyle = "red"; ctx.fillRect(10, 10, 50, 50); function copy() { const imgData = ctx.getImageData(10, 10, 50, 50); ctx.putImageData(imgData, 10, 70); } </script> <p> <button onclick="copy()">Copy</button> </p> </body> </html>