Essay (i): The object in the JavaScript function----arguments

About arguments

When calling a function, if you need to pass a parameter, the argument is an array, which can be accessed by the built-in object arguments of the function body, such as:

ARGUMENTS[0]: first parameter

ARGUMENTS[1]: Second parameter

ARGUMENTS[2]: Third parameter

ARGUMENTS[3]: Fourth parameter

Of course, in the name of the function, you can also do not need to name parameters, call arguments directly, such as:

Use the Length property in arguments to know the number of parameters passed in:

A function can pass in different parameters, so that the method can be overloaded in JavaScript by means of a parameter.

       function test () {            var len=arguments.length;            Switch (len) {case                0:alert ("This is a method without parameters");                Case 1:alert ("This is a method of 1 parameters");                Case 2:alert ("This is a method of 2 parameters");                Default:break;            }        }        Test ();                                           This is a method with no parameters        test ("I am the first parameter");                             This is a method of 1 parameters        test ("I am the first parameter", "I am the two parameter");              This is a method of 2 parameters

　　

Essay (i): The object in the JavaScript function----arguments