tryhtml5_canvas_textbaseline 在线代码实例

 <canvas id="myCanvas" width="400" height="200" style="border:1px solid #d3d3d3;">
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</canvas>
<script>
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
//在Y = 100画一条红线
ctx.strokeStyle="red";
ctx.moveTo(5,100);
ctx.lineTo(395,100);
ctx.stroke();
ctx.font="20px Arial"
//每个在y = 100的单词有不同的textbaseline值
ctx.textBaseline="top"; 
ctx.fillText("Top",5,100); 
ctx.textBaseline="bottom"; 
ctx.fillText("Bottom",50,100); 
ctx.textBaseline="middle"; 
ctx.fillText("Middle",120,100); 
ctx.textBaseline="alphabetic"; 
ctx.fillText("Alphabetic",190,100); 
ctx.textBaseline="hanging"; 
ctx.fillText("Hanging",290,100); 
</script>