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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>HTML canvas imgData.height属性使用-基础教程(div.cn)</title> </head> <body> <canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;"> Your browser does not support the HTML5 canvas tag.</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); var i; for (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> </body> </html>
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