<!DOCTYPE html><html><head><meta charset="utf-8"><title>HTML <canvas> width 属性使用-基础教程(div.cn)</title></head><body><canvas id="myCanvas" width="200" height="200" style="border:1px solid">Your browser does not support the HTML5 canvas tag.</canvas><br><script>var c = document.getElementById("myCanvas");var ctx = c.getContext("2d");ctx.fillStyle = "#92B901";ctx.fillRect(50, 50, 100, 100);function clearCanvas() { c.height = 300;}</script><button onclick="clearCanvas()">Clear canvas</button></body></html>