快乐就好 2017-02-24
推荐减法的for
jsperf地址:https://jsperf.com/zlq463947
<script src="//ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script> <script> var pi = Math.PI var a = new Array(1000000), e; </script>