HTML canvas 参考手册 - 在线编辑器

          <p>图片应用:</p>
<img src="/examples/img_lamp.jpg" id="lamp">
<p>画布:</p>
<button onclick="draw('repeat')">重复</button>
<button onclick="draw('repeat-x')">重复-x</button>
<button onclick="draw('repeat-y')">重复-y</button>
<button onclick="draw('no-repeat')">不重复</button>
<canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;">
您的浏览器不支持 HTML5 canvas 标签。
</canvas>
<script>
  function draw(direction) {
    var c = document.getElementById("myCanvas");
    var ctx = c.getContext("2d");
    ctx.clearRect(0, 0, c.width, c.height);
    var img = document.getElementById("lamp")
    var pat = ctx.createPattern(img, direction);
    ctx.rect(0, 0, 220, 128);
    ctx.fillStyle = pat;
    ctx.fill();
  }
</script>
        