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=\'#\'" //www.hiknow.com/user_photo/164086.jpg?t="+timestamp";

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