js生成图片

使用js代码生成一个图片对象

var img = new Image();
img.src = src;
// make sure the load event fires for cached images too
if ( img.complete || img.complete === undefined ) {
     img.src = "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==";
     img.src = src;
 }