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Editorial Team
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Asked: 2026-05-12T05:57:29+00:00

<!DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Strict//EN http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd> <html> <head> <meta http-equiv=Content-type content=text/html; charset=utf-8

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
    <head>
        <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
        <title>test</title>

    </head>
    <body>
        <script type="text/javascript" charset="utf-8">
            (function(){
                // this
                var test=function(){
                    //this
                    return function(){
                        //this
                    };
                }

                (function(){
                    //this
                    var a={
                        p1:function(){
                            //this
                        }
                    };
                })();
            })();
        </script>       
    </body>
</html>
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1 Answer

  1. Editorial Team

    David Dorward already mentioned about JavaScript: The Good Parts by Douglas Crockford.

    From Section 4.3 of that excellent book:

    Invoking a function suspends the
    execution of the current function,
    passing control and parameters to the
    new function. In addition to the
    declared parameters, every function
    receives two additional parameters:
    this and arguments. The this parameter
    is very important in object oriented
    programming, and its value is
    determined by the invocation pattern.
    There are four patterns of invocation
    in JavaScript: the method invocation
    pattern, the function invocation
    pattern, the constructor invocation
    pattern, and the apply invocation
    pattern. The patterns differ in how
    the bonus parameter this is
    initialized.

    Crockford continues to explains the binding of ‘this’ in each of these patterns, as follows:

    The Method Invocation Pattern: When a function is stored as a property of an object, we call it a method. When a method is invoked, this is bound to that object.

    The Function Invocation Pattern: When a function is invoked with this pattern, this is bound to the global object. This was a mistake in the design of the language.

    The Constructor Invocation Pattern: If a function is invoked with the new prefix, then a new object will be created with a hidden link to the value of the function’s prototype member, and this will be bound to that new object.

    The Apply Invocation Pattern: The apply method lets us construct an array of arguments to use to invoke a function. It also lets us choose the value of this. The apply method takes two parameters. The first is the value that should be bound to this. The second is an array of parameters.

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