为什么循环数组比JavaScript的本机`indexOf`快得多？ [英] Why is looping through an Array so much faster than JavaScript's native `indexOf`?

问题描述

为什么循环数组的速度比JavaScript的原生 indexOf 快得多？是否有错误或我不考虑的事情？我希望本机实现会更快。

  For Loop While Loop indexOf 
 Chrome 10.0 50,948,997 111,272,979 12,807,549 
 Firefox 3.6 9,308,421 62,184,430 2,089,243 
 Opera 11.10 11,756,258 49,118,462 2,335,347 
  

Chrome版本49.0.2623.87（64位）

Why is looping through an Array so much faster than JavaScript's native indexOf? Is there an error or something that I'm not accounting for? I expected native implementations would be faster.

                For Loop        While Loop      indexOf
Chrome 10.0     50,948,997      111,272,979     12,807,549
Firefox 3.6     9,308,421       62,184,430      2,089,243
Opera 11.10     11,756,258      49,118,462      2,335,347   

http://jsben.ch/#/xm2BV

解决方案

5 years from then, lot of changes happened in browsers. Now, indexOf performance has increased and is definitely better than any other custom alternative.

Chrome Version 49.0.2623.87 (64-bit)

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