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效果图
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>color</title> <style type="text/css"> *{ margin: 0; padding: 0; } #canvas{ background-color: #666666; } </style> </head> <body> <canvas id="canvas" width="600" height="300">Canvas not supported</canvas> <script type="text/javascript"> var canvas=document.getElementById(‘canvas‘); context=canvas.getContext(‘2d‘); var gradient=context.createRadialGradient(300,150,0,300,150,300); gradient.addColorStop(0,‘red‘); gradient.addColorStop(0.25,‘blue‘); gradient.addColorStop(0.5,‘black‘); gradient.addColorStop(0.75,‘yellow‘); gradient.addColorStop(1,‘green‘); context.fillStyle=gradient; context.fillRect(0,0,canvas.width,canvas.height); </script> </body> </html>
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原文地址：http://www.cnblogs.com/studyhtml5/p/5903422.html
