typescript create new object

First, the questionAfter installing the 3.4 mongdb, I randomly downloaded a Mongovue client online, unable to view the default database local collection, and the following issue occurred when creating the collection Error in creating new CollectionObject references are not set to an instance of an object.Type:System.NullReferenceExceptionStack: In MangoUI.ComNavTree.dbAddCollection_Click (Object sender, Ev

PropertyConstructor: A reference (pointer) to the function that created the object. For the object class, the pointer points to the original object () function.Prototype: A reference to the object's prototype of the object. For all classes, it returns an instance of Object o

——————————————————————————————————————————— Class method ① class Method: + The beginning of the method (defined as the process form and the object method, just the + start, which is the only difference) The invocation of the class method: [Class name Method name]; ② Object methods: -Methods to begin with Invocation of the object method: [Instance

Overview of keyword new "New" is the most commonly used keyword for Java developers, we use new to create objects, use new and instantiate anything we need with the ClassLoader, but you have a deep understanding of what new is do

Creating strong support for refactoring is one of the most important reasons software developers love Eclipse. And Eclipse has an advantage that is at least as good as refactoring, and that is its near-unassailable scalability. The combination of the two means that we can create new refactoring capabilities based on our own needs. 　　 introduce Refactoring plays an important role in the process of moder

Very happy, recently harvested a lot of knowledge, and found a lot of things, previously understood are wrong, or is superficial, still think oneself really get to the essence, also very sorry will affect some people go on the wrong road, but this also told us, read any article can not blindly to believe, to practice verification re-verification. Today to re-organize, my understanding of the object-oriented, of course, is not guaranteed to be complete

ecmascript. 4 This keyword This keyword is a very important concept in ecmascript and is usually used in object methods. Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> Function Whatfruit () {Alert (This. Color );} VaR Table1 = New Object;Table1.fruit = " Apple " ;Table1.w

method }→ called the constructor Using the Newinstance method of the constructor class }→ called the constructor Using the Clone method }→ no constructor is called Using deserialization }→ no constructor is called If you run the program at the end, you will find that method 4,5 creates the object with the constructor, and the method does not call the constructor.1. Use the

that is not defined using var, the variable will become a global variable. In general, we should avoid using variables not defined by var, mainly because it will affect the execution efficiency of the program, because the speed of accessing global variables is much slower than that of local variables. However, this method ensures that our variables must be global variables. In addition, to ensure speed, when using global variables, we can use var to define a local variable, and then assign it t

variables. However, this method ensures that our variables must be global variables. In addition, to ensure speed, when using global variables, we can use VaR to define a local variable, and then assign it to the global variable to obtain a local reference of the global variable. 1.2 variable type No variable defined. The type is undefined. The variable value can be a function. A function can act as a class in JavaScript. 1.3 variable scope Variable scope refers to the valid range of the variab

variables.However, this method ensures that our variables must be global variables.In addition, to ensure speed, when using global variables, we can use var to define a local variable, and then assign it to the global variable to obtain a local reference of the global variable.1.2 variable typeNo variable defined. The type is undefined.The variable value can be a function.A function can act as a class in JavaScript.1.3 variable scopeVariable scope refers to the valid range of the variable lifec

1. Object-oriented programming (OOP) features :Abstraction: Seizing the core issueEncapsulation: Methods can only be accessed through objectsInherit: Inherit new object from existing objectPolymorphism: Different forms of multiple objectsNote: This article refers to http://www.cnblogs.com/yuxingyoucan/p/5797142.htmlI. Several ways to

This article translated from: dojo objectStores Original Author: Kris zyp Translation: Siqi Dojo 1.6 introduces a new data store API named dojo object store. This set is based on HTML5 indexeddb objectStore API The new store API aims to greatly simplify the interaction and construction of the dojo store. This new API

, looks like an "egg". (3) The Second Life evolution, it has a "tail" and "gills", with the tail and gill properties, indicating that it is a "tadpole." (4) The third life evolution, its tail and Gill disappeared, but also grow "four legs" and "lung", with legs and lung attributes, which eventually become a "frog." Therefore, the object of the "class" is from scratch, and constantly evolve, and eventually disappeared in the intangible. "Class" can

It has been two months since the beginning of C #3. x. In the previous chapter, we have discussed C #3 in depth. some new column features introduced by x: Anomynous Type, Extension Method, Lambda Expression, and Automatically Implemented Property. Today we will discuss the other two simple Feature involved in this series: object Initializer and Collection Initializer. I,Why should we introduce

The new document in Fireworks will be saved as a Portable Network Graphics (PNG) document. PNG is the intrinsic file format for Fireworks. The shapes you create in Fireworks can be exported or saved in a variety of Web and graphics formats. Regardless of which optimization and export settings you choose, the original Fireworks PNG file is preserved for later editing. C