declare boolean in javascript

The built-in objects commonly used in JS are: Arrays, Boolean classes, number classes, strings. The following describes the respective common methodsThe array in JS1. Declaration of an arrayThe ① literal declaration uses the [] Declaration array

We often see some data types in javascript, such as "undefined", "boolean", and "string, this article will help you learn the basic JavaScript data types, value types, and reference types. For more information, see this article, four basic data

JavaScript is a weak type or dynamic language. This means that you do not need to declare the variable type in advance. During the program running, the type will be automatically determined. This also means that you can use the same variable to save

JavaScript Learning Summary1.JavaScript is a programming language for Web and HTML.2.JavaScript code must be placed between tags, javascript is now the HTML default scripting language, so in There is no need to declare the scripting language as

Four basic data types in javascript: numeric values (integers and real numbers), string literals (characters or values enclosed by "" or "), Boolean (make True or false), and null values. The data in the basic type of JavaScript can be constants or

The history of JSIn the 1995 of the last century, Netscape was the most famous first generation Internet company in the Web era with its navigator browser.Because Netscape wanted to be able to add some dynamic effects to the static HTML page, it was

Select title:Fill in the blanks questions:Question and Answer question:1. What is JavaScript? (This is the basic problem, for many programmers is also send sub-problem!) ）JavaScript is a client and server-side scripting language that can be inserted

javascript| Beginners | data | structure JavaScript, which provides scripting languages, is very similar to C + +, except that it removes easily-generated errors such as pointers in C and provides a powerful class library. For people who already

Introduction to JavaScriptJavaScript is a scripting languageJavaScript is a lightweight programming language.JavaScript is a programmatic code that can be inserted into an HTML page.When JavaScript is inserted into an HTML page, it can be performed

To master JavaScript, first of all, we must discard the interference of some other advanced languages such as Java, C #, and other class-oriented Object-oriented thinking, fully understand the features of the original type of JavaScript