How to check Developer tool window open

http://stackoverflow.com/questions/7798748/find-out-whether-chrome-console-is-open

In my case,




I use check4.js

check1.js, check2.js code can't check developer tools open event.
check3.js code check using setInterval() function.

check4.js
code use Object definedProperty() function on get() function.
console.log("%c hello", element)

When console.log called, element object call get() function.
And you can check developer tools open

Happy Coding!

jsPerf

http://jsperf.com/

This site test javascript performances.

About test example
 triple-equals-vs-double-equals

Page like this.

If you click 'Run tests'

processing and return result to you.
like this.

Testing in Chrome 48.0.2564.97 32-bit on Windows NT 6.3 64-bit

Test		Ops/sec
===	if (s1 === s2) {} if (s1 === s3) {} if (s1 === s4) {} if (s1 === s5) {}	126,211,632±1.51%89% slower
==	if (s1 == s2) {} if (s1 == s3) {} if (s1 == s4) {} if (s1 == s5) {}	10,709,041±5.01%99% slower
!==	if (s1 !== s2) {} if (s1 !== s3) {} if (s1 !== s4) {} if (s1 !== s5) {}	70,270,530±0.00%fastest
!=	if (s1 != s2) {} if (s1 != s3) {} if (s1 != s4) {} if (s1 != s5) {}	5,273,440±0.00%fastest
=== on same type only	if (s1 === s3) {} if (s1 === s5) {} if (s1 === s3) {} if (s1 === s5) {}	739,712,962±0.00%fastest
== on same type only	if (s1 == s3) {} if (s1 == s5) {} if (s1 == s3) {} if (s1 == s5) {}	565,679,421±0.00%fastest
!== on same type only	if (s1 !== s3) {} if (s1 !== s5) {} if (s1 !== s3) {} if (s1 !== s5) {}	706,719,526±0.00%fastest
!= on same type only	if (s1 != s3) {} if (s1 != s5) {} if (s1 != s3) {} if (s1 != s5) {}	1,133,703,804±0.00%fastest