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smallnewer avatar smallnewer commented on June 22, 2024

千万别用forEach循环数组。性能超差。
http://jsperf.com/array-each1
http://jsperf.com/fastest-array-loops-in-javascript/267

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smallnewer avatar smallnewer commented on June 22, 2024

常用运算测试：
http://jsperf.com/operation1
http://jsperf.com/operation2

常用运算总体不会特别慢，只是相对间作比较。只在大量运算的时候，可以用性能好的运算方式替换不好的运算方式，可以取得一些优化效果。

  1. 尽量避免 弦操作:sin asin atan 等。
  2. 除法没有乘法性能好，能用乘法尽量用乘法。
  3. 开方性能也不好，和乘法差距较大。不过比弦操作要好不少。
  4. random()获取随机数性能

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smallnewer avatar smallnewer commented on June 22, 2024

部分JS性能测试：http://my.oschina.net/u/1401419/blog/191199

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smallnewer avatar smallnewer commented on June 22, 2024

判断是否数组。
参照：http://jsperf.com/instanceof-array-vs-array-isarray/5
Array.isArray性能也是糟透。通用的toString方式是最慢的，比isArray慢几个量级。千万别用。
arr instanceof Array 比较靠谱
但是更快的选择是arr.constructor === Array

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