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<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Document</title>

</head>

<body>

    <canvas id="canvas" style="margin:0 auto;border:1px #ddd solid;">

        The current browser does not support Canvas, can replace the browser a try!

    </canvas>

    <script>

        window.onload = function(){

            var canvas = document.getElementById('canvas');

            canvas.width = 800;

            canvas.height = 800;

            if(canvas.getContext('2d')){

                var context = canvas.getContext('2d');

                // begin

                var backgroundImage = new Image();

                backgroundImage.src = "img/1.png";

                backgroundImage.onload = function(){

                    var pattern = context.createPattern(backgroundImage,'repeat');

                    context.fillStyle = pattern;

                    context.fillRect(0,0,canvas.width,canvas.height)

                }

            }else{

                alert('当前游览器不支持Canvas，请更换游览器后再试！');

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        }

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</body>

<script>

    /*总结

        //填充图片

        createPattern(img,repeat-style)

        repeat-style:

            repeat-x

            repeat-y

            repeat

            no-repeat

        //填充canvas

        createPattern(canvas,repeat-style)

        //填充video

        createPattern(video,repeat-style)

    */

</script>

</html>