如何改变间隔时间

Question

使用setInterval方法可以改变间隔时间吗？

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var sites = [
      ["http://localhost:8888/uploads/?img=Screen Shot 2016-06-02 at 21.30.32.png",1000],
      ["http://localhost:8888/uploads/?img=Screen Shot 2016-06-02 at 19.30.46.png",3000]
    ];
    var currentSite = sites.length;
    $(document).ready(function () {
      var $iframe = $("iframe").attr("src",sites[0][0]);
      setInterval(function() {
        (currentSite == 0) ? currentSite = sites.length - 1 : currentSite = currentSite -1;
        $iframe.attr("src",sites[currentSite][0]);
      }, sites[currentSite][1]);
    });

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