Analysis of this example in JavaScript_javascript skills

It seems that this sentence is very reasonable if you use people as a mirror to know the gains and losses.

Demo 1:
If it is a global function, this is equivalent to the window object. Various properties or methods defined in the function can be accessed outside the function, provided that this function needs to be called. .

Copy code The code is as follows:

Demo 2:
If you use new to instantiate an object, this is not equal to the window object, this points to the instance of function a

Copy the code The code is as follows:

Demo 4:
Whether it is directly referencing a function or instantiating a function, the closure returned This in the function all points to window

Copy code The code is as follows:

Demo 5:
in This is used in HTML and generally represents the element itself

Copy code The code is as follows:

< div onclick="test(this)" id="div">Click Me

Demo 6:
Register events under IE and Firefox (Chrome), this points to the window and the element itself respectively

Copy code The code is as follows:

Click Me< /div>

The above is my summary of the different application scenarios of this in javascript. There may be other situations, and I will add them if I find them later.