how to call back no caller id

, and when you call the function testaguments, you will find that "undefined" is displayed, indicating that the property is not arguments. That is, arguments is not an array object.CallerReturns a reference to the function that called the current function.Functionname.callerThe FunctionName object is the name of the function being executed.DescriptionFor a function, the caller property is defined only when

context, the result and functionName. toStringThat is to say, The Decompilation Text of the function is displayed.The following example illustrates the usage of caller attributes:// Caller demo {Function callerDemo (){If (callerDemo. caller ){Var a = callerDemo. caller. toString ();Alert ();// The name Of The function

javascript| concept Before you mention the above concepts, first of all, let's talk about the implied parameters of functions in javascript: arguments Arguments The object represents the function being executed and the arguments of the function that called it. [function.] Arguments[n]Parameter function: option. The name of the Function object that is currently executing. N: Options. The 0-based parameter value index to pass to the Function object.Description Arguments is a hidden object that is

variables in the Out function.Two features of closures:1, as a reference to a function variable-when the function returns, it is in the active state.2, a closure is when a function returns, a stack that does not release resources.Example 1:HTML codeCopy CodeThe code is as follows:Example 2:HTML codeCopy CodeThe code is as follows:Example 3:JS CodeCopy CodeThe code is as follows:Description: One of the key techniques is to create an additional execution environment by executing a single-line (in

() {This.initialize.apply (this, arguments);}}}Parsing: From the code perspective, the object contains only one method: Create, which returns a function, the class. But it's also a class.constructor, which calls initialize, which is the initialization function defined at the time the class is created. Through this way,You can implement the class creation pattern in prototypeExample:var vehicle=class.create ();vehicle.prototype={Initialize:function (type) {This.type=type;}Showself:function () {A

starts. The following example details these properties:Copy codeThe Code is as follows:// Usage of the arguments object.Function ArgTest (a, B ){Var I, s = "The ArgTest function expected ";Var numargs = arguments. length; // obtain the value of the passed parameter.Var expargs = ArgTest. length; // obtain the value of the expected parameter.If (expargs S + = expargs + "argument .";ElseS + = expargs + "arguments .";If (numargs S + = numargs + "was passed .";ElseS + = numargs + "were passed .";S

numargs = arguments. length; // obtain the value of the passed parameter.VaR expargs = argtest. length; // obtain the value of the expected parameter.If (expargs S + = expargs + "argument .";ElseS + = expargs + "arguments .";If (numargs S + = numargs + "was passed .";ElseS + = numargs + "were passed .";S + = "\ n"For (I = 0; I S + = "Arg" + I + "=" + arguments + "\ n ";}Return (s); // return the parameter list.} A code indicating that arguments is not an array (array class) is added here: Array

the function starts. The following example details these properties: // Usage of the arguments object.Function argtest (a, B ){VaR I, S = "The argtest function expected ";VaR numargs = arguments. length; // obtain the value of the passed parameter.VaR expargs = argtest. length; // obtain the value of the expected parameter.If (expargs S + = expargs + "argument .";ElseS + = expargs + "arguments .";If (numargs S + = numargs + "was passed .";ElseS + = numargs + "were passed .";S + = "\ n"For (I =

The call method invokes one method of an object, replacing the current object with another object (in fact, changing the object's internal pointer, which changes the contents of the object's this point). JS code Call ([thisobj[,arg1[, arg2[, [,. ArgN]]]) parameter thisobj Optional. The object that will be used as the current object. Arg1, Arg2,, ArgN options available. The method parameter sequence will be

arguments object.Function ArgTest (a, B ){Var I, s = "The ArgTest function expected ";Var numargs = arguments. length; // obtain the value of the passed parameter.Var expargs = ArgTest. length; // obtain the value of the expected parameter.If (expargs S + = expargs + "argument .";ElseS + = expargs + "arguments .";If (numargs S + = numargs + "was passed .";ElseS + = numargs + "were passed .";S + = "\ n"For (I = 0; I S + = "Arg" + I + "=" + arguments [I] + "\ n ";}Return (s); // return the parame

these properties: CopyCode The Code is as follows: // the usage of the arguments object. Function argtest (a, B ){ VaR I, S = "The argtest function expected "; VaR numargs = arguments. length; // obtain the value of the passed parameter. VaR expargs = argtest. length; // obtain the value of the expected parameter. If (expargs S + = expargs + "argument ."; Else S + = expargs + "arguments ."; If (numargs S + = numargs + "was passed ."; Else S + = numargs + "were passed ."; S + = "\ n" For (I = 0

Before you mention the above concepts, first of all, let's talk about the implied parameters of functions in javascript: arguments Arguments The object represents the function being executed and the arguments of the function that called it. [function.] Arguments[n] Parameter function: option.The name of the Function object that is currently executing. N: Options. The 0-based parameter value index to pass to the Function object. Description Arguments is a hidden object that is created in addition

The first thing to say is the implied parameters of a function in javascript: arguments Arguments The object represents the function being executed and the arguments of the function that called it. [function.] Arguments[n] Parameter function: option. The name of the Function object that is currently executing. N: Options. The 0-based parameter value index to pass to the Function object. Description Arguments is a hidden object that is created in addition to the specified parameters when a functi

Before referring to the above concepts, I would like to start by talking about the implicit parameters of the functions in javascript: argumentsArgumentsThe object represents the function being executed and the parameters of the function that called it.[function.] Arguments[n]Parameter function: option. The name of the Function object that is currently executing. N: Option. The 0-based parameter value index to pass to the Function object.DescriptionArguments is a hidden object that is created in

authoritative guide" gives an example, apply the caller property to write a debug function, to output a stack of traces [function of tracking stack])How to get the name of a function//defining a function method for functions xxx () {}varReg =/function * (\w*) \ (\w*\)/;functionTest () {};varFunname =test.tostring (). Match (reg);if(funname) {Console.log (funname[1]);//Output: Test}//for var xxx = function () {} definition MethodvarTest =function(){};

(Callerdemo. Caller) {VaRA=Callerdemo. Caller. Arguments [0];Alert ();} Else {Alert ("This is a top Function");} } Function Handlecaller () {Callerdemo ();} // Callerdemo (); // Handlecaller ("parameter 1", "parameter 2 "); /** Shows the callee attribute of the function.* Description: arguments. callee: the initial value is the function object being executed. It is used fo

(Arguments.selfvalue);}Running the code you will find that the first alert shows 1, which means that the array object has the Selfvalue property, the value is 1, and when you call the function testaguments, you will find that "undefined" is displayed, stating that the property is not arguments. That is, arguments is not an array object.Second, callerReturns a reference to the function that called the current function.Functionname.callerThe FunctionNa

Concept Before you mention the above concepts, first of all, let's talk about the implied parameters of functions in javascript: arguments Arguments The object represents the function being executed and the arguments of the function that called it. [function.] Arguments[n]Parameter function: option. The name of the Function object that is currently executing. N: Options. The 0-based parameter value index to pass to the Function object.Description Arguments is a hidden object that is created in a

arguments, caller, callee, this is a special set of objects that are used in function. Apply () and call () are different ways of calling a function.ArgumentsCan be used to get the actual array of function-passing variables. This variable is particularly suitable for writing "polymorphism" functions, that is, you can do different things depending on the number of incoming arguments.Example One – Add functio

One, call methodCall one of the object's methods and replace the current object with another object (in fact, change the object's internal pointer, that is, change the object's this point). JS Code Call ([thisobj[,arg1[, arg2[, [,. argn]]]] Parameters Thisobj Options available. The object that will be used as the current object. Arg1, Arg2, argn. Options available. A sequence of method parameters is passed.