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In millions of Internet pages, JavaScript is used to improve design, verify forms, detect browsers, and create cookies. Javascript is the most popular scripting language on the Internet and can be run in all major browsers, for example, Internet Explorer, Mozilla, Firefox, Netscape, and opera ".
Javascript is a scripting language based on object and event-driven with secure performance. This language is used with HTML hypertext markup language, Java Applet (Java smallProgram) Link multiple objects in a web page to interact with Web customers, so as to develop client applications. So we need to learn JavaScript.
(1) JavaScript is a scripting language.
(2) JavaScript is an object-based language.
(3) JavaScript is simple.
(4) JavaScript has high security.
(5) JavaScript is dynamic and can respond directly to user or customer input without passing through web service programs.
(6) JavaScript is cross-platform.
In the HTML documentMedium, two typesProgramming Language,JavascriptUse"<SCRIPT>... </SCRIPT>"AndJavaUse"<APPLET>... </APPLET>".
Javascript can be embedded in HTML in multiple ways:
(1) embedded in the HTML webpage Header
(2) embedded in an HTML webpage
(3) embedded in element events of HTML Web pages
(4) calling existing JavaScript files in HTML
Example 1 tell the user
<HTML>
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = gb2312"/>
<Title> JavaScript tutorial </title>
<! -- Script -->
<SCRIPT type = "text/JavaScript">
What_to_say = "hello ";
Alert (what_to_say );
</SCRIPT>
</Head>
<Body style = "overflow: auto;">
</Body>
</Html>
The prompt "Hello!" appears !"
Example 2 whether the prompt time is displayed
<HTML>
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = gb2312"/>
<Title> Hello </title>
</Head>
<Body style = "overflow: auto; padding: 0px; margin: 0px;">
<Div style = "font-size: 14px; font-weight: bold; color: #000; font-family: Arial,; Background-color: # e3e3e3; padding: 4px 10px; ">
User: Hello
<SCRIPT>
If(Confirm ("do you need to display the time? ")){
Dt =NewDate ();
Document. Write (", current time is ");
Document. Write (Dt. tolocaletimestring ());
}
</SCRIPT>
</Div>
</Body>
</Html>
The message "do you need to display the time?" appears ?"
When we click yes, the time will appear.
In fact, no matter what language it is, you must write it by yourself and use it by yourself to understand how to use it.
This JavascriptThis is the end.Let's learn JavaScript from scratch
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