tryhtml5_canvas_imagedata_height 在线代码实例

 <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>
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
var imgData=ctx.createImageData(100,100);
alert("Height of imgData is: " + imgData.height);
for (var i=0;i<imgData.data.length;i+=4){
	imgData.data[i+0]=255;
	imgData.data[i+1]=0;
	imgData.data[i+2]=0;
	imgData.data[i+3]=255;
}
ctx.putImageData(imgData,10,10);
</script>