<!DOCTYPE html>
<head><script src="https://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script><script>function testing(){ var string = '1u2,1u3,1u4,1u5'; var count = 0; for (var i = 0; i < string.length; i++) { if (string[i] == ',') { count++; } } mytimer = setInterval(function(){test();}, 2000); //利用setInterval实现间隔两秒执行一次test()函数 function test(){ var barcode=string.split(',')[count]; count--; if(count<0){clearInterval(mytimer);} //clearInterval取消循环 alert(barcode); }}</script></head><body><input type="button" style="margin-left:50%;margin-top:20%;" value="test" οnclick="testing();" /></body></html>