<!DOCTYPE HTML><html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><title>HTML5绘制径向渐变图形</title><script type="text/javascript">window.onload = function(){var canvas = document.getElementById("canvas");var context = canvas.getContext("2d");var g1 = context.createRadialGradient(400, 0, 0, 400, 0, 400);g1.addColorStop(0.1, "rgb(255, 255, 0)");g1.addColorStop(0.3, "rgb(255, 0, 255)");g1.addColorStop(1, "rgb(0, 255, 255)");context.fillStyle = g1;context.fillRect(0, 0, 400, 350);var g2 = context.createRadialGradient(250, 250, 0, 250, 250, 300);g2.addColorStop(0.1, "rgba(255, 0, 0, 0.5)");g2.addColorStop(0.7, "rgba(255, 255, 0, 0.5)");g2.addColorStop(1, "rgba(0, 0, 255, 0.5)");for(var i = 0; i < 10; i++){context.beginPath();context.fillStyle = g2;context.arc(i * 25, i * 25, i * 10, 0, Math.PI * 2, true);context.closePath();context.fill();}}</script></head><body><canvas id="canvas" width="600" height="400"></canvas></body></html>
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