"JavaScript" note 01--making Stuff happen???

While, generally speaking, HTML is forContent and CSS is forPresentation, JavaScript is forInteractivity.

1. From HTML to JavaScript, like this:

<! DOCTYPE html>        <script>            alert ("Hello, World");        </script>    </body>

Alert means a warning, similar to a message. The effect is to pop up a dialog box.

2. Referring to the external. js File

<!DOCTYPE HTML><HTML>    <Head>        <MetaCharSet= "UTF-8">        <title></title>    </Head>    <Body><script src= "script.js" ></script>    </Body></HTML>

Script.js

Alert ("Hello, World");

3, running JavaScript code in the browser console, chrome access to the console shortcut key is F12

4, before the formal start of study, need to emphasize is:

A Browser then runs JavaScriptLine-by-line, starting at the top of the file orscriptElement and finishing at the bottom (unless-it to go elsewhere).

5, ask the user last name of the small program

<! DOCTYPE html>      var surname = prompt (' Greetings friend, May I enquire as to your surname? ');         </script>    </body>

Running this code through the browser will jump out of a "small box" and ask for your last name.

6, the variable is similar to a "box", we use it to store data; it has "name" and "value".

Statement (Declaration)

var surname; var age;

Initialize (initialization)

var name = "Tom";

Assign Value (Assignment)

Name = "Andy"= 43;

"JavaScript" note 01--making Stuff happen???