Use JS to detect whether the browser uses developer tools under Chrome

When browsing the Web page, I inadvertently see a detection browser using the Developer tools method, which is hereby recorded

code example:

1 (function() {2     var re=/x/; 3     var i=0; 4     Console.log (re); 5 6     re.tostring=function() {7         return ' first ' + (++i) + ' Open console '8     }9 }) ();

The principle is as follows:

Console output if the object (including the regular expression is an object), the object's reference is preserved, and the output

is the real-time value of the object, that is, when the object content is changed to reflect its change (if the console is reopened),

Actually, yes. Recall the ToString () method of the object when you close and then turn on the console.

This overwrites the ToString method of the RE object, saves the counter I with the closure, and each time you reopen the console ToString

method is automatically called and the counter is incremented by 1.

Use JS to detect whether the browser uses developer tools under Chrome