what value of null

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JavaScript basic syntax

1. Data typeJavaScript data typesBasic type:Number: NumericString: StringsBoolean: Boolean typeSpecial types:Null: EmptyUndefined: Not definedComplex Type:Array: ArraysObject: Objects2.String typeRepresents textA sequence of Unicode characters,

High-quality C/C ++ programming guide-expressions and basic statements

This series of articles is a summary of the key words "high quality programming guide-C ++/C language ".This article summarizes the expressions and basic statements: Operator priority:Priority Operator Name or meaning Usage Integration

Five data Organization Mode 4) fully sorted, mixed.

The previously mentioned partition, sub-box mode is not concerned about the order of data. The next full sort, mixed sort mode is concerned withdata follows the specified keyfor parallelSort。Full Sort explanation; Sorting is easy to implement in a

Go The life cycle of a Java virtual machine

Java Virtual machine Architecture Java Virtual machine life cycleThe bounden duty of a runtime Java Virtual machine instance is to be responsible for running a Java program. When a Java program is started, a virtual machine instance is created. When

10 geeks and secrets about JavaScript

Author: Andy CroxallLink to the original article: Ten Oddities And Secrets About JavaScriptTranslation Editor: Zhang xinxuData Types and definitions1. Null is an object. Among many JavaScript types, there is a Null type, which has a unique value of

Java Collection framework 08 -- HashMap and source code analysis

Java Collection framework 08 -- HashMap and source code analysis1. Introduction to HashMap First, let's take a look at the inheritance relationship of HashMap.   java.lang.Object ? java.util.AbstractMap ? java.util.HashMap

The offsetparent attribute usage of JS is detailed

JS's offsetparent attribute usage is detailed:This property is more commonly used in JavaScript properties, for its good grasp is also very necessary, the following through the code example to introduce its use, hoping to bring some help to the

Java NULL pointer exception (JAVA.LANG.NULLPOINTEREXCEPTION)

A null pointer exception (JAVA.LANG.NULLPOINTEREXCEPTION) is thrown when any method is called in Java for a pointer with a value of NULL. Null pointer exceptions are definitely one of the hardest exceptions to find and debug in Java, and you'll

Python entry object type and python entry object

Python entry object type and python entry object Python uses an object model to store data. Constructing a value of any type is an object All Python objects have three features: identity, type, and value. Identity: Each object has a unique identity

Place JavaScript code

1. Put it in the headThis method loads js Code before the page is manned. In this way, we cannot obtain webpage elements in the head because the webpage has not been loaded. Let's look at the example below, when we want to dynamically modify the

Java face question set (more practical)

What is a 1.Java set frame? What are some of the advantages of a collection framework? There are collections in each programming language, and the original Java version contains several collection classes: Vector, Stack, Hashtable, and array. With

R Language Programming Art (2) data structures in R

This article corresponds to the "R Language Programming Art" chapter 2nd: Vectors; Chapter 3rd: matrices and Arrays; chapter 4th: list; 5th: Data frame; 6th chapter: Factors and tables==================================================================

The combination of Struts2 and Jquery.ajax ()

1. The client transmits data to login.action through the $.ajax () method;2, where the Execute () method in action returns a value of NULL and passes "servletactioncontext.getresponse (). Getwriter (). Print (result); "Method to upload data to

JS data type

The JavaScript data type is very concise, it only defines the basic data type in 6 Null: null, none. Represents a non-existent when the property of an object is assigned a value of null, which means that the property is deleted Undefined: Not

Data types in JavaScript

JavaScript contains five basic data types (raw data types), namely: Undefined, NULL, number, Boolean, string; and a reference type Object, the reference type contains a special class: the function type. Number, Boolean, String three basic types for

Front-end Basic tutorial-jquery Easyui Easyloader Instances

   Brother even front-end HTML5 training to share Easyloader instances of -jquery Easyui To move the panel to other position  $ (' #p '). Panel (' move ', {  LEFT:100,  top:100  });Property:  The title, type is string, is the caption text that is

C language null and 0 differences and null explanations

 First look at the following section of code output what:#include int main () { int *p=null; printf ("%s", p); }Output , single-step debugging you can see that the value of executing int *p=null,p is 0x00000000, as you can see, NULL is 0 in

"Reading notes" You don't know JavaScript (roll up)--what is the scope

Chapter I. Scope1. Understanding the ScopeIntroduction to several nounsEngine: Responsible for compiling and executing the entire JavaScript program from beginning to endCompiler: Responsible for parsing and code generator and other dirty live

Null and undifined differences in JS and the role of NULL

There are two primitive types in javascript: null and undefined. These two types often make JavaScript developers confused, when is null, and when is undefined?The undefined type has only one value, which is undefined. When the declared variable has

Professional JavaScript for WEB developers 3rd Edition---reading notes

1. Triggering this event when the domcontentloaded Dom tree is builtLoad page loading complete triggerNative JSfunction () { //code ... .. false );d Ocument.addeventlistener (function() { //code ... false);Jquery// domcontentloaded$ (document)

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