在HTML5画布元素上绘制的图像的颜色改变

function display(img1, red, gr, bl) { //func to change color of image    var canvas1 = document.createElement(&#39;canvas&#39;);//canvas element initialisationcanvas1.width = img.width;//canvas width initialisation    canvas1.height = img.height; //canvas height initialisationvar ctx1 = canvas1.getContext(&#39;2d&#39;);    ctx1.drawImage(img, 0, 0);var myImg =ctx1.getImageData(0, 0, canvas1.width, canvas1.height);for (var t=0;t< myImg.data.length;t+=4) {           myImg.data[t]= red | myImg.data[t];           myImg.data[t+1]= gr | myImg.data[t+1];           myImg.data[t+2]= bl | myImg.data[t+2];    }ctx1.putImageData(myImg,0,0); // Image data is adjusted according to context    return c;},