您的函数既不是可链接的也不是jQuery动画，这是delay()唯一起作用的内容(更精确地说，.fx队列中的所有内容)，尝试这样的事情:

Your function is neither chainable nor a jQuery animation, which is the only thing delay() works on (anything in the .fx queue to be more precise), try something like this :

success: function(data){
    changeImage( "http://site.com/syncD.png" );
    setTimeout(function() {
        changeImage( "http://site.com/sync.png" );
    }, 500);
}