请问canvas跨域问题如何解决

var ctx = canvas.getContext('2d');
var imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
如果canvas中的图片源的url(http://10.4.60.44:7002/......)与当前应用的url(http://10.4.60.44:7003/......)不相同，
浏览器控制台出现: Failed to execute 'getImageData' on 'CanvasRenderingContext2D': The canvas has been tainted by cross-origin data.,请问该如何解决呢？

需要做代理
http://blog.csdn.net/molaifeng/article/details/42293509