hfc apply

1. Object Inheritance in js There are three inheritance methods in js: 1. prototype inheritanceCopy codeThe Code is as follows:2. constructor implementation inheritanceCopy codeThe Code is as follows:3. call and apply implement inheritanceCopy codeThe Code is as follows:Ii. call and apply usage (details) In js, both call and apply can be inherited. The unique par

Apply: The apply and applyIf methods in Ext are used to apply attributes of an object to another object, which is equivalent to copying attributes. The difference is that apply will overwrite the properties in the target object, while applyIf only copies the properties in the target object but not in the source object.

This article mainly introduces the difference between $ watch (), $ digest () and $ apply () in AngularJS. If you are interested, refer to $ watch () in AngularJS $ scope (), $ digest () and $ apply () are core functions of AngularJS. To learn about AngularJS, you must understand these functions. When you bind a variable in $ scope to the view, AngularJS automatically creates a "Watch" internally ". "Watch

The usage and difference between call and apply in JavaScript, javascriptapply Apply accepts two parameters. The first parameter specifies the point of this object in the function body. The second parameter is a set with a lower mark. this set can be an array or a class array, the apply method passes the elements in this set as parameters to the called function:

There is a very common question, "what is the difference between call and apply?" "Everyone knows the answer: they differ only in the way they accept parameters, the second argument passed to call must be enumerated, and the second argument passed to apply is an array, as follows function sum (num1,num2) { return num1 + num2;} function Callsum (num1,num2) { return sum.call (this, num1,num2);} function

is static, and if there is a class with the same name, it acts as its companion class. In object, you can generally do some initialization for the associated class, such as the Val Array=array (PS: It uses the Apply method) that we often use[Java]View PlainCopy Object dog{ private var age=0 def age={ age+=1 Age } } Class dog{ var age1=dog.age //dog.age is a private field of object Dog. It reminds me of t

Use of 1.apply, call changes the This objectApply and call use function person (age,sex) {this.age=age;this.sex=sex;} Add a method through the prototype person.prototype.sayhi=function (x, y) {console.log ("hello" +this.sex); return 1000;} var person=new person (10, "male");p erson.sayhi ();//function Student (name,sex) {this.name=name;this.sex=sex;} At this time the problem of the prototype object is changed, Var stu=new Student ("Xiao Ming", "shemal

4 issues related to this, new, call and apply The principle of this pointer is a very complicated question, and if we illustrate this from the implementation mechanism of this in JavaScript, many friends may become more and more confused, so this article is going to change the idea of the this pointer from an application perspective, It is more realistic to understand this pointer from this perspective. Let's take a look at how the this pointer is use

The most direct understanding of call and apply is inheritance. Call and apply, and they all function to bind a function to another object to run Format and parameter definitions for both: Call (Thisarg [, ARG1,ARG2, ...]); Parameter list, ARG1,ARG2, ...Apply (Thisarg [, Argarray]); Parameter array, Argarray The this pointer within the two functions above wil

Yesterday, when writing a statement, encountered a phenomenon, is actually using cross apply to do a concatenation of strings. Like whatCREATE TABLEGoodscatalog (IDINT, NameNVARCHAR( -)) CREATE TABLEGoods (IDINT, GoodscatalogidINT, NameNVARCHAR( -)) INSERT intoGoodscatalog (ID, Name)VALUES(1,'Fruit'),(2,'Sporting Goods')INSERT intoGoods (Id,goodscatalogid, Name)VALUES(1,1,'Apple') ,(2,1,'Banana') ,(3,2,'Football') ,(4,2,'Basket

Discuss Function. apply () ------ (Function hijacking and Object replication) about Object inheritance, the general method is to use the copy method: Object. extend See the implementation method of protpotype. js: The code is as follows: Object. extend = function (destination, source ){For (property in source ){Destination [property] = source [property];}Return destination;} In addition, there is also an uncommon method: Function.

Although apply and call can implement same function.However, there is a litter different between them. Please pay attention-to-look at the examples below:Define an object person1 person=function(name,age) {2this . name=name; 3 this. age= age; 7 }89var pin=New//Create an objectAfter then, we need to define some functions (skating,running,eating) with different parameter s respectively.1 functionSkating ()//It don ' t need any parameter2 {3Alert