javascript压缩图片无刷新上传

首先要说明，该方式我没有实现成功，主要问题点是压缩后能拿到压缩后图片地址，确不知道怎么上传上去，如果有哪位大牛可以指点一二，万分感谢。

图片压缩代码:

compress: function(source_img_obj, quality, output_format){
                 var mime_type = "image/jpeg";
                 if(output_format!=undefined && output_format=="png"){
                    mime_type = "image/png";
                 }
                 var cvs = document.createElement('canvas');
                 //naturalWidth真实图片的宽度
                 cvs.width = source_img_obj.naturalWidth;
                 cvs.height = source_img_obj.naturalHeight;
                 console.log(source_img_obj);
                 var ctx = cvs.getContext("2d").drawImage(source_img_obj, 0, 0);
                 var newImageData = cvs.toDataURL(mime_type, quality/100);
                 console.log(newImageData);
                 var result_image_obj = new Image();
                 result_image_obj.src = newImageData;
                 console.log(result_image_obj);
                 return result_image_obj;
            },