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Javascript: is Object-based and event-driven client script |
1, the introduction of the page (head tag);
2, the introduction of the page (body tag inside);
3. Introduction of element Events (tag attribute introduced);
4, the introduction of external JS file;
First, the introduction of JS page headerThe introduction of JS in the header refers to writing JavaScript within the
1 <!DOCTYPE HTML> 2 <HTML>3 <Head>4 <title></title>5 <Scripttype= "Text/javascript">6 //Write a JavaScript program here7 </Script>8 </Head>9 <Body>Ten </Body> One </HTML>
Description
<script type= "Text/javascript" >......</script> format is fixed, JavaScript code must be written within the <script></script> tag, And you must set the Type property value to "Text/javascript".
<script type= "Text/javascript" >......</script> this sentence to remember, oh, don't write a JavaScript program, even this sentence to come back here to copy the code past AH.
Second, the introduction of JS in the pageThe introduction of JS in the page refers to writing JavaScript within the <body></body> tag.
1 <!DOCTYPE HTML> 2 <HTML>3 <Head>4 <title></title>5 </Head>6 <Body>7 <Scripttype= "Text/javascript">8 //Write a JavaScript program here9 </Script>Ten </Body> One </HTML>Third, the introduction of JS in the element event
The introduction of JS in an element event means that a JavaScript program or call is written directly in a property of an element, which refers to the element's "event attribute".
1 <!DOCTYPE HTML> 2 <HTMLxmlns= "http://www.w3.org/1999/xhtml">3 <Head>4 <title></title>5 </Head>6 <Body>7 <inputtype= "button"OnClick= "alert (' Green leaf Learning net ')"value= "button"/>8 </Body>9 </HTML>
Iv. introduction of external JS files
The introduction of external JS files, the white is to put the JavaScript program in a suffix named. js file, and then use the script tag to refer to. In addition, the script tag that references the external JS file can be placed inside the head tag or in the body tag. Generally only with some plug-ins written in the head, most of it is written in the body of the bottom, because when the page loaded CSS and HTML is loaded first.
1 < src= "js/index.js" type= "Text/javascript"></ Script>
This is some of the commonly used JS introduction Way ~ ~ ~
"Introduction of JavaScript Fang"
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