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This article mainly introduces how to quote external stylesheets, internal stylesheets and inline styles in CSS. It is very detailed and has certain reference value. Friends who are interested must finish reading it!

Introduction to JavaScript

JavaScript is a scripting language.

JavaScript is a lightweight programming language.

JavaScript is programming code that can be inserted into a HTML page.

After JavaScript is inserted into the HTML page, it can be executed by all modern browsers.

JavaScript is the most popular programming language in the world. This language can be used in HTML and web, and can be widely used in devices such as servers, PC, laptops, tablets and smartphones.

JavaScript: writing to HTML output

JavaScript can be written directly to the HTML output stream:

[xss_clean] ("This is a heading"); [xss_clean] ("

This is a paragraph.

")

You can only use [xss_clean] in the HTML output stream. If you use a document after it has been loaded (such as in a function), it will overwrite the entire document.

JavaScript: react to events

My first paragraph JavaScript

JavaScript can react to events. Such as clicking on a button:

Click here.

Tip: using JavaScript to process HTML content is a very powerful feature.

You will often see document.getElementByID ("some id"). This method is defined in HTML DOM.

DOM (document object Model) is the official W3C standard for accessing HTML elements.

JavaScript: changing HTML ima

Function changeImage () {element=document.getElementById ("myimage") if (element.src.match ("bulbon")) {element.src= ".. / images/light-off.gif";} else {element.src= ".. / images/light-on.gif";}}

Click here.

Tip: changing the style of the HTML element is a variant of changing the HTML attribute.

JavaScript: validating input

My first paragraph JavaScript

Please enter a number. If the input value is not a number, the browser will pop up a prompt box.

Function myFunction () {var x=document.getElementById ("demo") .value; if (x = "" | | isNaN (x)) {alert ("Not Numeric");}}

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