javascript not null or undefined

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Analysis of null and undefined judgments and differences in JavaScript

A bad time to answer, especially undefined, because this involves the realization of the principle of undefined. So, after thinking carefully, write down this article, please heroes to shoot bricks. Total known: null = = undefined However: null!==

Explore the abyss of Null and Undefined in JavaScript

When discussing the primitive data types in Javascript, most people know the basic knowledge, from String, Number to Boolean. These primitive types are quite simple and behavior is common sense. However, this article will focus more on the unique

2016.8.01 "" Null undefined NaN 0 Special comparison is true or false

In the JavaScript world, whether it's a function, an array, an object, or a string, a number, or a Boolean type, there are always a few maverick in these data types, and then there are some nasty bugs that are dispensable.The reason these annoying

Differences between undefined and null in javascript _ javascript skills

There are two primitive types in JavaScript: Null and Undefined. These two types often make JavaScript developers confused, when is it Null, and when is it Undefined? Most computer languages have only one value indicating "None", such as NULL in C,

JavaScript type system--undefined and NULL

Previous wordsGeneral programming language, which means null only, but JavaScript designer Brendan Eich design a undefined, which undoubtedly increases the complexity of the program, but there are some reasons for this. This article will detail the

False, zero, null, undefined, and empty string objects in Javascript

False, zero, null, undefined, and empty string objects in Javascript In Javascript, We often come into contact with the five special objects mentioned in the question -- false, 0, empty string, NullAnd undefined. These objects are easy to use

Explore the abyss of Null and Undefined in JavaScript

When discussing the primitive data types in JavaScript, most people know the basic knowledge, from String, Number to Boolean. These primitive types are quite simple and behavior is common sense. However, this article will focus more on the unique

Differences between null, Nan, and undefined in Javascript

1. Type Analysis:   The data types in JS include undefined, Boolean, number, string, and object. The first four are original data types and the second are reference data types. Code Code highlighting produced by Actipro CodeHighlighter (

The difference between undefined and null in JavaScript _javascript skills

Most computer languages have and have only one value that denotes "none", such as the nil of the None,ruby language of the Null,python language of the C language Null,java language. Oddly enough, the JavaScript language actually has two values that

Undefined and Null analysis of JavaScript type system _javascript skills

Front. The General program language, which indicates null only NULL, but JavaScript designer Brendan Eich but designed a undefined, which undoubtedly increased the complexity of the program, but there are some reasons for this. This article

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