Jquery 循环内间隔执行 异步执行

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<script type="text/javascript"> var arr = new Array(); var arrk = 0; jQuery(function() { arr[0] = "aaa.keleyi.com"; arr[1] = "bbb.keleyi.com"; arr[2] = "ccc.keleyi.com"; mytime = setInterval(function(){showme()}, 2000); function showme(){ alert(arr[arrk]); arrk += 1; if(arrk>2) clearInterval(mytime); } }); </script>