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<canvas id="myCanvas" width="200" height="100" style="border:1px solid #d3d3d3;">
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var c = document.getElementById('myCanvas');
var ctx = c.getContext('2d');
var gra = ctx.createRadialGradient(40,50,20,40,60,100);
gra.addColorStop(0,'red');
gra.addColorStop(1,'green');
ctx.fillStyle = gra;
ctx.fillRect(10,10,180,90)
输入 CSS 代码……