equality operator

Original addressJavaScript has a lot of quirks and incomprehensible places. Among them null& undefined is more interesting. Now that you have it, why does JavaScript have to get a null?Equality ComparisonLet's start by having a look at the following

JavaScript is a dynamic scripting language with a high degree of grammatical freedom and incomplete design maturity. Because of its highly flexible syntax and a variety of other reasons, the code written with it is extremely readable (at least I

This article transferred from: http://www.cnblogs.com/xsyblogs/p/3938521.htmlJavaScript is the front-end prerequisite, and this one of the essence is too much, recently in the review of some things are relatively easy to ignore, here record, on the

= = denotes equalityThat is, only compare the values of the variables on both sides are equal.The type conversions that are hidden by the equality operator introduce some counterintuitive results.This is why it is recommended that you try not to use

The automatic boxing and unpacking is introduced from Java 1.5 to automatically convert the original type value to the corresponding object. The automatic boxing and unpacking mechanism allows us to use primitive types or object types more simply

JavaScript Standard Reference Tutorial (Alpha) Noteshttp://javascript.ruanyifeng.com/#introduction2.1.4 N--: Use n again to execute n=n-1;--N: Execute n=n-1 before using n;The 2.1.5 chunk ({}) var does not constitute a separate scope for the

Chapter II, lexical structure1.javascript program is written in Unicode character set, 2 bytes2. Case sensitive, which means JavaScript needs to be case sensitive3.JavaScript ignores spaces, tabs, and line breaks between tokens in the program.4. In

During the development of JavaScript, you often encounter repetitive tasks such as merging files, compressing code, checking syntax errors, converting SASS code into CSS code, and so on. Usually, we need to use different tools to accomplish

If the table contains hierarchical data, you can use the Hierarchy query clause to select the row-level order. 1. The grammar of the hierarchy query clause Hierarchy query clause syntax: {CONNECT by [nocycle] condition [and condition] ... [START

1, expression: Simplest expression: A direct amount or variable name. var a = 1; The value of a direct-weight expression: itself. Value of the variable expression: The value that the variable holds or refers to. 2, Operator: Unary operators: for

Notes 1, structure (struct) and classes (class)[Attributes] [modifiers] struct identifier [: interfaces] body [;]Structs are similar to classes in that they represent data structures that can contain data members and function members. Unlike

Three-valued logical classes in C # The practical value of the three-valued logic has not been neglected, and in most books introducing relational database knowledge, it involves the discussion of NULL value and the three-valued logic. MSDN, however,

First, the basic grammar 1. Basic syntax and variables 2. Data type 3. Tips Summary 1. Basic syntax and variables1.1 StatementsJavaScript is a line of execution (line), in general, each row is a statement, the statement

JavaScript is the front-end prerequisite, and this one of the essence is too much, recently in the review of some things are relatively easy to ignore, here record, on the one hand is to hope that they can be handy in peacetime application, on the

Note: Reference sources with no title but pages are referred to as the sixth edition of the JavaScript Authority guide, and other references have title or URL annotations.One, easy to produce misunderstanding knowledge point record1, [] = =! []All

Spring Festival at home Idle Nothing, to see ES6, selected Ruan a peak big "ES6 Standard Primer" This book, understand the new JS specification. Here to do some reading notes. ECMAScript 6 Notice Currently, the newer versions of the major browsers

When calling a function, there is no space between the function name and the left parenthesis. There is no space between the function name and the argument sequence, and there is a space between all other syntactic elements and the left parenthesis.

Type conversions can be divided into implicit conversions and explicit conversions, which are called implicit conversions, which are automatically converted by programs at run time, and explicit conversions are artificially cast on types. JavaScript

When discussing the raw data types in JavaScript, most people know the basics from string, number to Boolean. These primitive types are fairly simple and behave in a common sense. However, this article will focus more on the unique raw data types

Five types of policies, column-related policies, and column masks make VPD a more powerful tool in the DBA's security toolbox The Virtual Private database (VPD), also known as fine-grained access control, provides powerful row-level security