<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("imgdata的宽度是: " + imgData.width); 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>