What can a JavaScript do?
JavaScript gives HTML designers a programming tool - HTML authors are normally not programmers, but JavaScript is a scripting language with a very simple syntax! Almost anyone can put small "snippets" of code into their HTML pages
JavaScript can put dynamic text into an HTML page - A JavaScript statement like this: document.write("<h1>" + name + "</h1>") can write a variable text into an HTML page
JavaScript can react to events - A JavaScript can be set to execute when something happens, like when a page has finished loading or when a user clicks on an HTML element
JavaScript can read and write HTML elements - A JavaScript can read and change the content of an HTML element
JavaScript can be used to validate data - A JavaScript can be used to validate form data before it is submitted to a server. This saves the server from extra processing
JavaScript can be used to detect the visitor's browser - A JavaScript can be used to detect the visitor's browser, and - depending on the browser - load another page specifically designed for that browser
JavaScript can be used to create cookies - A JavaScript can be used to store and retrieve information on the visitor's computer
Source link: http://www.w3schools.com/js/default.asp
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javascript所对应的全选和反选 。操作数据库记录。
以下是页面代码:
<tr>
<td colspan="6" width="100%">
<table border="2" width="100%">
<tr class="center">
<th width="20%& ......
由于安全方面的考虑,
Javascript
被限制了跨域访问的
能力,但是有时候我们希望能够做一些合理的跨域访问的事情,那么怎么办呢?
这里分两类情况:
一、基于同一父域的子域之间页面的访问
&nb ......
var vKeyCode= e.getKeyCode();
if (vKeyCode >= 65 && vKeyCode <= 90 ) // Caps Lock 打开
{
......
简介
1st JavaScript Editor 是一款强大的JavaScript开发、校验和调试工具,它简单易用,不论你是初学者或者是专业的开发人士,都可以轻松上手!同时它又是完美的Ajax (Asynchronous JavaScript and XML),CSS, HTML, DOM DHTML开发工具!
Beside rich possibilities of editing scripts (JavaScript, ......
<html>
<head>
<mce:script type = "text/javascript"><!--
function changetext()
{
var x = document.getElementById("list");
for (var i = 0;i < x.length;i++ )
{
if (x.options[i].selected)
{
document.getElemen ......