console.time显示运行相同功能的不同时间 [英] console.time shows different time running the same function
问题描述
我使用console.time来显示功能的时间。但是我发现它显示了相同功能的不同运行时间。
我简化了功能,如下所示:
const findIP =(res)=> {
let arr = []
arr = res.split(',')
}
console.time('1')
findIP('1, 2,3,4,5,6,7,8,9,0')
console.timeEnd('1')
console.time('2')
findIP(' 1,2,3,4,5,6,7,8,9,0')
console.timeEnd('2')
两者之间的时间差非常大。
我尝试运行几次。而且仍然要花费不同的时间。
在以下链接中引用答案:
如果多次缩短运行,则V8引擎具有一个JIT编译器,该编译器将优化该代码段,以便在下一次运行时更快。 //stackoverflow.com/a/54601440\">https://stackoverflow.com/a/54601440
I use console.time to show the time of the function. But I found that it shows different running time of the same function.
I have simplified my function as below:
const findIP = (res) => { let arr = [] arr = res.split(',') } console.time('1') findIP('1,2,3,4,5,6,7,8,9,0') console.timeEnd('1') console.time('2') findIP('1,2,3,4,5,6,7,8,9,0') console.timeEnd('2')
The time difference between the two is very large.
I have tried to run several times. And it still cost different time.
解决方案To quote the answer in the the following link:
If you run shorten multiple times, the V8 engine has a JIT compiler that will optimize that piece of code so it runs faster the next time.
https://stackoverflow.com/a/54601440
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