FireFox img 图片缓存

  设置img的src，加入时间戳。

  var timestamp = Date.parse(new Date());//获取时间戳

  $("#photoUrl").attr("src","http://www.hiknow.com/user_photo/164086.jpg?t="+timestamp);

  or：

  document.getElementById("#photoUrl").src ="http://www.hiknow.com/user_photo/164086.jpg?t="+timestamp";