javascript check if null

Accidentally saw a foreigner wrote the discussion JavaScript in undefined and null article, I also learn to translate a back. Find this English is not to rust. Original English:

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

, native JavaScript implements string length interceptionView Code2. Native JavaScript gets the domain hostView Code3. Native JavaScript Clear spaceView Code4. Native JavaScript replaces allView Code5. Native JavaScript Escape HTML tagView Code6.

This article mainly introduces the Null and Undefined primitive data types in javascript. If you need them, you can refer to the basic knowledge that most people know when discussing the primitive data types in JavaScript, from String, Number to

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 original data

You can just check if the variable have a truthy value or not. That meansif( value ) {}Would evaluate to true if are not value : Null Undefined NaN Empty string ("") 0 False The above list represents all possible

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

Directory1 History 2 clarifying misunderstandings 3 basic concepts 4 features 5 different from Java 6 development toolsHistoryProbably in 1992, a company called Nombas began developing an embedded scripting language called C-minus (C-minus-minus, or

Original article: javascript quirk 2: Two "non-values"-undefined and null 2: two null values: undefined and null Translator: singleseeker For "null" or "null reference", mostProgramming LanguageThere is only one value. For example, null is

Body: For null or empty references, most programming languages have only one value. For example, null is used in Java. However, Javascript has two special values: undefined and null. They are basically the same, but their usage is slightly different.