web 版processing显示图片

直接上代码啊

<script type="text/javascript" src="https://rawgit.com/processing-js/processing-js/v1.4.8/processing.min.js"></script>
<script type="application/processing" data-processing-target="pjs">
/* @pjs preload="http://wasss.oss-cn-beijing.aliyuncs.com/a.jpg"; */
PImage online;
void setup(){
  String url="http://wasss.oss-cn-beijing.aliyuncs.com/a.jpg";
  online = loadImage(url);
  size(online.width,online.height);
  noLoop();
}
void draw(){
  image(online,0,0);
}
</script><canvas id='pjs'> </canvas>

图片现在在网页的最底部呢。