A brief discussion on the this pointer in Javascript_javascript skills

(1) Use this in the global execution environment to identify the Global object, which is the window object in the browser.
(2) When using this in a function execution environment, if the function is not obviously an attribute of a non-window object, but just defines a function, regardless of whether the function is defined in another function, in this function The this still identifies the window object. If the function is explicitly used as a property of a non-window object, then this in the function represents this object.

Copy code The code is as follows:

var o=new Object;
o.func =function()
{
alert((this===o));
(function(){
alert((this===window));
}
)();
}
o.func();

(3) When a function is called through the new operator, the function is treated as a constructor, and this points to The object created by the constructor.

For more details, please refer to
Javascript this pointer