<!DOCTYPE html><html><head lang="en"> <meta charset="UTF-8"> <title></title></head><body><canvas id="canvas" style="border: 1px solid #aaa;display: block;margin: 50px auto"> 当前浏览器不支持canvas，请更新浏览器再试</canvas><script> window.onload=function(){ var canvas=document.getElementById("canvas"); canvas.width=800; canvas.height=800; var context=canvas.getContext("2d"); drawStar(context,150,300,400,400,30); } function drawStar(cxt,r,R,x,y,rot){ cxt.beginPath(); for(var i=0;i<5;i++){ context.lineTo(Math.cos((18+i*72-rot)/180*Math.PI)*R+x,-Math.sin((18+i*72-rot)/180*Math.PI)*R+y); context.lineTo(Math.cos((54+i*72-rot)/180*Math.PI)*r+x,-Math.sin((54+i*72-rot)/180*Math.PI)*r+y); } cxt.closePath(); cxt.stroke(); }</script>
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