案例：html/html5 案例     状态：可编辑再运行    进入竖版
 运行结果　
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<!DOCTYPE html>
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<html>
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<body>
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​
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<canvas id="myCanvas" width="400" height="200" style="border:1px solid #d3d3d3;">
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Your browser does not support the HTML5 canvas tag.</canvas>
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​
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<script>
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​
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var c=document.getElementById("myCanvas");
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var ctx=c.getContext("2d");
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​
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//Draw a red line at y=100
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ctx.strokeStyle="blue";
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ctx.moveTo(5,100);
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ctx.lineTo(395,100);
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ctx.stroke();
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​
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ctx.font="20px Arial"
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​
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//Place each word at y=100 with different textBaseline values
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ctx.textBaseline="top";
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ctx.fillText("Top",5,100);
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ctx.textBaseline="bottom";
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ctx.fillText("Bottom",50,100);
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ctx.textBaseline="middle";
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ctx.fillText("Middle",120,100);
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ctx.textBaseline="alphabetic";
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ctx.fillText("Alphabetic",190,100);
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ctx.textBaseline="hanging";
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ctx.fillText("Hanging",290,100);
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​
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</script>
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​
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</body>
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</html>
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​