function apply

Recently I have read a lot of JavaScript Library source code, such as prototype and Ext core. These libraries are widely applied to this concept. It was not until yesterday that the book "Return of the JavaScript King" had a profound understanding

　　the first thing to say is that thepoint of this is not deterministic at the time of the function definition, and only when the function is executed can you determine who this is pointing to, In fact, this ultimately points to the object that

The Set_error_handler () function sets the user-defined error-handling function. This function is used to create the user's own error handling method during runtime. The function returns the old error handler and returns null if it fails. Let's

Apply, callIn JavaScript, call and apply are meant to change the context in which a function is run, in other words, to change the direction of this within the function body.A major feature of JavaScript is the notion that a function has a "context

Apply, call, bind, and list some of their magical refinement to deepen the memory.Apply, callIn JavaScript, call and apply are meant to change the context in which a function is run, in other words, to change the direction of this within the

In JavaScript, call and apply are meant to change the context in which a function is run, in other words, to change the direction of this within the function body.Let's start with an example:function="Red"function() {console.log (this. Color );}}

constructor function. The function to be called by the New keyword, which returns the object of the specified property. Use the New keyword to invoke the functionNew is an operator, and there are 4 things that happen when you call a function using

JavaScript functions 定义时上下文 运行时上下文 have concepts such as "" and "" and " 上下文是可以改变的 "apply and call functions Call () and apply () all exist to change a function 运行时的上下文 (context), in other words, to change the direction of this within the

Off TopicThis plug-in is more heavyweight .... With the familiarity of writing native JS efficiency to improve very much ... And, not only supports JS but also includes the Nodejs snippetJavascript-snippetsPlugin Author: ZenorochaGitHub Address:

I saw in the beginning of the JavaScript function apply and call, very vague, see also do not understand, recently saw some articles on the Web on the Apply method and some examples of call, finally is a bit of a look, here I do the following notes,

This article explains the function from 5 aspects. The function is defined as a reusable set of code. By encapsulating common common code into functions, you can avoid copying and pasting back and forth, and you need to search for code and paste

JavaScript authoritative Guide To learn notes, Forbidden reprint!6. FunctionsFunction Call Method:Direct call: foo ();Method invocation as an object: Obj.method ();New:new Foo ();Call/apply/bind:func.call (obj);If there is no return statement in the

1. Apply Calll　　In JavaScript, call and apply are meant to change the runtime context of a function, in other words, to change the direction of this within the function.　　Here we have a new object banana object But without say method we can use the

From the very beginning, I read about bind (), call () and apply () in my book, but for a long time, I have been familiar with the three methods that have been exposed to many of these three methods in my work. So make a brief description of their

I saw in the beginning of the JavaScript function apply and call, very vague, see also do not understand, recently saw some articles on the Web on the Apply method and some examples of call, finally is a bit of a look, here I do the following notes,

DOCTYPE HTML>HTMLLang= "en">Head> MetaCharSet= "UTF-8"> title>Titletitle> Script> //First Use: The function context mode changes the point of this var Age= +; functionFun () {Console.log ( This. Age); } varobj={age: -

First, explore the principle of call methodfunction (obj) {/// 1, let the this in FN point to obj// eval (this.tostring (). Replace ("This", "obj")); // 2. Let the FN method execute again // This ();}functionfn1 () {Console.log (1); Console.log (

Bole Online column Author-Chokcoco If you have a good article to submit, please click here to learn more If you want to reprint, send "reprint" Two words to view the description This article is really difficult to write, because there

In a relational database system, in order to satisfy the third normal form (3NF), it is necessary to separate the table that satisfies the "transitive dependency" into a separate table and connect the related table through the join clause, there are

For this point in JavaScript, you may be as confused as I am, and today, by learning some of the authors ' deep understanding of this, it is useful to transcribe the following:This article mainly cited to: Chasing dream son, if necessary can guide