英文版javascript教程资源-CSDN文库

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本教程是关于JavaScript的英文版初学者指南，详细介绍了JavaScript的基础知识及其在网页开发中的应用。以下知识点涵盖了教程中提到的内容： 1. **JavaScript简介**：JavaScript是一种由Netscape公司开发的脚本语言，用于在HTML网页中使用。它与Java语言有一定的松散联系，但完全是两种不同的技术。JavaScript被内置于所有主流的现代浏览器中，用于创建基于网络的应用程序，与Java和HTML都有很好的互补性和集成性。 2. **JavaScript特性**： - 轻量级：作为解释型编程语言，JavaScript通常不需要复杂的编译过程。 - 网络中心应用设计：JavaScript被设计为用于创建网络相关的应用程序。 - 与Java互补：尽管JavaScript与Java类似，但它们在语法和功能上并不相同，JavaScript通常用于前端开发，而Java多用于后端开发。 - 与HTML互补：JavaScript可以用来增强HTML页面的功能，使得网页更加动态和交互性强。 3. **JavaScript语法**： - JavaScript代码通常放在HTML页面中的<script>标签内。 - JavaScript语句的简单结构如下：<script>JavaScript代码</script>。 - <script>标签具有两个重要的属性，分别是"language"和"type"。 - “language”属性指定使用哪种脚本语言，但这个属性已逐渐被淘汰。 - “type”属性用来指定脚本语言，推荐使用值"text/javascript"。 4. **第一个JavaScript脚本示例**： - 该示例展示了如何编写一个简单的JavaScript程序，使用document.write()方法输出"HelloWorld!"。 - 示例代码如下： ```html <html> <body> <scriptlanguage="javascript"type="text/javascript">  </script> </body> </html> ``` - 执行上述代码将在网页中显示"HelloWorld!"。 5. **空白和换行**： - JavaScript会忽略程序中的空格、制表符和换行符。 - 开发者可以自由地使用这些空白字符来格式化和缩进代码，以便于阅读和理解。 - 分号在JavaScript中是可选的，如果一行代码的末尾没有其他语句，JavaScript解释器会自动将其视为语句的结束。以上内容是基于教程的部分内容提取的知识点，详细介绍了JavaScript语言的基础知识和基本语法结构。对于初学者来说，掌握这些概念对于学习如何编写JavaScript代码是十分重要的。同时，教程还建议读者访问***/javascript了解更详细的JavaScript相关知识。尽管提供的内容是英文版，但它被认为是“很不错”的教程，适合初学者进行学习。

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Tutorials Point, Simply Easy Learning

1 | P a g e

Javascript Tutorial

Tutorialspoint.com

Javascript is a scripting language produced by Netscape for use within HTML Web

pages.

JavaScript is loosely based on Java and it is built into all the major modern browsers.

This tutorial gives an initial push to start you with Javascript. For more detail kindly

check tutorialspoint.com/javascript

What is JavaScript ?

JavaScript is:

 JavaScript is a lightweight, interpreted programming language

 Designed for creating network-centric applications

 Complementary to and integrated with Java

 Complementary to and integrated with HTML

 Open and cross-platform

JavaScript Syntax:

A JavaScript consists of JavaScript statements that are placed within the <script>... </script>

HTML tags in a web page.

You can place the <script> tag containing your JavaScript anywhere within you web page but it

is preferred way to keep it within the <head> tags.

The <script> tag alert the browser program to begin interpreting all the text between these

tags as a script. So simple syntax of your JavaScript will be as follows

JavaScript code

</script>

The script tag takes two important attributes:

 language: This attribute specifies what scripting language you are using. Typically, its

value will be javascript. Although recent versions of HTML (and XHTML, its successor)

have phased out the use of this attribute.

 type: This attribute is what is now recommended to indicate the scripting language in

use and its value should be set to "text/javascript".

So your JavaScript segment will look like:

JavaScript code

</script>

Your First JavaScript Script:

Let us write our class example to print out "Hello World".

Tutorials Point, Simply Easy Learning

4 | P a g e

 Global Variables: A global variable has global scope which means it is defined

everywhere in your JavaScript code.

 Local Variables: A local variable will be visible only within a function where it is

defined. Function parameters are always local to that function.

JavaScript Variable Names:

While naming your variables in JavaScript keep following rules in mind.

 You should not use any of the JavaScript reserved keyword as variable name. These

keywords are mentioned in the next section. For example, break or boolean variable

names are not valid.

 JavaScript variable names should not start with a numeral (0-9). They must begin with

a letter or the underscore character. For example, 123test is an invalid variable name

but _123test is a valid one.

 JavaScript variable names are case sensitive. For example, Name and name are two

different variables.

JavaScript Reserved Words:

The following are reserved words in JavaScript. They cannot be used as JavaScript variables,

functions, methods, loop labels, or any object names.

abstract

boolean

break

byte

case

catch

char

class

const

continue

debugger

default

delete

double

else

enum

export

extends

false

final

finally

float

for

function

goto

implements

import

instanceof

int

interface

long

native

new

null

package

private

protected

public

return

short

static

super

switch

synchronized

this

throw

throws

transient

true

try

typeof

var

void

volatile

while

with

The Arithmatic Operators:

There are following arithmatic operators supported by JavaScript language:

Assume variable A holds 10 and variable B holds 20 then:

Operator

Description

Example

Adds two operands

A + B will give 30

Subtracts second operand from the first

A - B will give -10

Multiply both operands

A * B will give 200

Divide numerator by denumerator

B / A will give 2

Modulus Operator and remainder of after an

integer division

B % A will give 0

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