Js Code used to determine whether the object is a window

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The results are varied:
[Object Object] IE6
[Object Object] IE8
[Object Window] firefox3.6
[Object Window] opera10
[Object DOMWindow] safai4.04
[Object global] chrome5.0.3.22
Let's take a look at how to determine whether a famous person has a property called setInterval. It seems that the generalization function is not rigorous, but it cannot be rigorous, because in IE, it cannot determine whether the generalized function is a function, Object. prototype. toString. [object] is displayed for all calls, and there is no name attribute. Because it is too easy to copy, discard it.
In desperation, check the attributes one by one to see what special attributes are available. Finally, we found that there is a window attribute with the same name, which is an infinite loop reference itself. This is still a problem in IE.

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IE will pop up false, and other browsers will pop up true. However, all browsers are unified as follows:

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Are there any rigorous judgments? Do not forget that window references itself in an infinite loop. It should be said that it references the previous one. Therefore, we can:

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Finally, it is concluded that:
Copy codeThe Code is as follows:
Var isWindow = function (obj ){
Return obj. window = obj. window. window
}

==================================== Gorgeous demarcation line ====================== ========
Thanks for the inspiration provided by Ivony!
Copy codeThe Code is as follows:
Function isWindow (obj ){
If (typeof obj! = "Object") return false; // it must be an object
Var expando = "dom" + (new Date-0) // generate a random variable name
// Globally parse the code. The eval of IE is only valid for the original scope.
// See http://www.javaeye.com/topic/519098
// In addition, eval and with are prohibited in strict html5 mode!
Var js = document. createElement ("script ");
Var head = document. getElementsByTagName ("head") [0];
Head. insertBefore (js, head. firstChild );
Js. text = expando + "= {};"
Head. removeChild (js)
Return window [expando] === obj [expando]
}
IsWindow)