用一个渐变笔触来写文本 "Big smile!" - 在线编辑器

          <canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;">
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</canvas>
<script>
  var c = document.getElementById("myCanvas");
  var ctx = c.getContext("2d");
  ctx.font = "30px Verdana";
  // 创建渐变
  var gradient = ctx.createLinearGradient(0, 0, c.width, 0);
  gradient.addColorStop("0", "magenta");
  gradient.addColorStop("0.5", "blue");
  gradient.addColorStop("1.0", "red");
  // 渐变填
  ctx.strokeStyle = gradient;
  ctx.strokeText("Big smile!", 10, 50);
</script>
        