HTML5 Canvas ( 图片填充样式 ) fillStyle, createPattern

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>canvas</title>
    <script type="text/javascript" src="../js/jQuery.js"></script>
    <style type="text/css">
        *{
            margin: 0;
            padding: 0;
            outline: none;
            border: none;
        }
        #canvas{
            width: 7rem;
            margin: .25rem 0 0 1.5rem;
            border: 1px solid black;
        }
    </style>
</head>
<body>
    <canvas id="canvas" width="1000" height="600"></canvas>
</body>
</html>
<script type="text/javascript">
    /**
     * rem 布局初始化
     */
    $('html').css('font-size', $(window).width()/10);
    /**
     * 获取 canvas 画布
     * 获取 canvas 绘图上下文环境
     */
    var canvas = $('#canvas')[0];
    var cxt = canvas.getContext('2d');

    /**
     * 创建图片填充样式
     * 一: createPattern( 图片对象, 重复方式 )
     * 二: createPattern( canvas对象, 重复方式)
     * 三: createPattern( 视频对象, 重复方式)
     */

    /*
    var img = new Image();
    img.src = "../img/favicon.ico";
    img.onload = function(){
        var pattern = cxt.createPattern(img, "repeat");
        cxt.fillStyle = pattern;
        cxt.fillRect(0, 0, 1000, 600);
    }
    */

    var fiveStartPath = function(cxt){
        cxt.beginPath();
        var x = 0; y = 0;
        for(var i = 0; i < 5; i++){
            x = Math.cos((18+72*i)/180*Math.PI);
            y = Math.sin((18+72*i)/180*Math.PI);
            cxt.lineTo(x, 0-y);
            x = Math.cos((54+72*i)/180*Math.PI)/2.0;
            y = Math.sin((54+72*i)/180*Math.PI)/2.0;
            cxt.lineTo(x, 0-y);
        }
        cxt.closePath();
    }

    var drawFiveStar = function(cxt, fiveStart){
        cxt.save();
        cxt.translate(fiveStart.offsetX, fiveStart.offsetY);
        cxt.rotate(fiveStart.RotationAngle/180*Math.PI);
        cxt.scale(fiveStart.Radius, fiveStart.Radius);
        fiveStartPath(cxt);
        cxt.fillStyle = "yellow";
        cxt.fill();
        cxt.restore();
    }

    var createCanvas = function(){
        var canvas = document.createElement("canvas");
        canvas.width = 100;
        canvas.height = 100;
        var cxt = canvas.getContext('2d');
        var fiveStart = {
            Radius: 50,
            offsetX: 50,
            offsetY: 50,
            RotationAngle: 0
        }
        drawFiveStar(cxt, fiveStart);
        return canvas;
    }

    var canvasBackground = createCanvas();
    var patten = cxt.createPattern(canvasBackground, "repeat");
    cxt.fillStyle = patten;
    cxt.fillRect(0, 0, 1000, 600);
</script>