Javascript Trap Window Global Object _javascript Tips

function Test () {
This.name= ' Test ';
var name=2;
This.show=function () {
alert (name);
alert (this.name);//Display Name
}
}
var test=new test ();//Create an object from the constructor
Test.show ()//Output 2 and ' Test ', stating that the object method must add this when accessing its properties.

function Test2 () {
This.name= ' Test2 ';
This.show=function () {
alert (name);
alert (this.name);
}
}
Test ();//Direct call to test ();
var test2=new Test2 ();
Test2.show ()//Output test,test2, very strange Ah, name asked what is worth, and how can it be ' Test ', bug?
alert (name);
Window.show (); Output 2,test; How could there be a show function, a bug?

Output 2,test sequentially; Test,test2; Test;2,test

FF and IE6 are the same running results, it seems not a bug, that is why?
Note: When an object method accesses the properties of its object | must | (not the same as Java).
The entire page is the default |window| object, then the defined function, the default is the Window object's method.
Direct call function directly, the equivalent of through window. Call method, then the method inside of this is naturally
Window object, this.name= ' Test ' is a property added to the Window object.
If name is not defined in the method local scope and call alert (name), it is equivalent to calling alert (Window.name);
* * Ah, the code is confusing. This looks like a very serious trap!! */