怎么把个%75，%25,去掉阴影。并且饼图要阴影。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>阴影饼图</title>
<style>
#mycanvas{
border: 2px solid #7FFFD4;
}
</style>
<script>
function draw () {
var mycanvas=document.getElementById("mycanvas");
var ctx=mycanvas.getContext("2d");
//阴影
ctx.shadowOffsetX=7;
ctx.shadowOffsetY=7;
ctx.shadowBlur=5;
ctx.shadowColor="#999999";
//第一个圆
ctx.fillStyle="#7FFFD4";
ctx.moveTo(200,200);
ctx.arc(200,200,100,0,1.5*Math.PI);
ctx.closePath()
ctx.fill()
//第二个圆
ctx.fillStyle="#ADFF2F";
ctx.moveTo(220,180);
ctx.arc(220,180,100,0,1.5*Math.PI,true);
ctx.closePath()
ctx.fill()
//文字渐变
var gradient=ctx.createLinearGradient(0,0,0,250);
gradient.addColorStop(0,"green");
gradient.addColorStop(1,"yellow");
ctx.fillStyle=gradient;
ctx.font='italic 30px 微软雅黑';
ctx.fillText('%75',140,240)
ctx.fillText('%25',230,150)
}
</script>
</head>
<body onload="draw()">
<canvas id="mycanvas" width="500" height="500" ></canvas>
</body>
</html>
