<!DOCTYPE html><html><head><meta charset="UTF-8"><title>canvas</title></head><body><canvas id="canvas" style="border: 1px solid #aaa; display: block;margin: 50px auto;">當(dāng)前瀏覽器不支持Canvas，請更換瀏覽器</canvas><script>var tangram = [{p:[{x:0,y:0},{x:800,y:0},{x:400,y:400}],color:"#caff67"},{p:[{x:0,y:0},{x:400,y:400},{x:0,y:800}],color:"#67becf"},{p:[{x:800,y:0},{x:800,y:400},{x:600,y:600},{x:600,y:200}],color:"#ef3d61"},{p:[{x:600,y:200},{x:600,y:600},{x:400,y:400}],color:"#f9f51a"},{p:[{x:400,y:400},{x:600,y:600},{x:400,y:800},{x:200,y:600}],color:"#a594c0"},{p:[{x:200,y:600},{x:400,y:800},{x:0,y:800}],color:"#fa8ecc"},{p:[{x:800,y:400},{x:800,y:800},{x:400,y:800}],color:"#67becf"}]alert(tangram);window.onload =function(){var canvas = document.getElementById("canvas");canvas.width = 800;canvas.height = 800;var context =canvas.getContext("2d");for(var i = 0; i<tangram.length;i++){draw(tangram[i],context)}function draw(piece,cxt){cxt.beginPath();cxt.moveTo(piece.p[0].x,piece.p[0].y);for(var i=1;i<piece.p.length;i++){cxt.lineTo(piece.p[i].x,piece.p[i].y);cxt.closePath();cxt.fillStyle = piece.color;cxt.fill();}}}</script></body></html>
為何沒有效果?
等待2062
2017-12-26 11:07:38
