一个非常健全的 Javascript 链接(URL)解析类

用 Javascript 解析链接(URL)是一个常见的需求,本文介绍了一个非常健全的用 Javascript 写的链接(URL)解析类,他可以准确获取一个完整的 URL 中每个部分的内容,包括协议、URL中包含的用户名和密码、主机名、端口、路径名、参数、锚点(Fragment Anchor)等信息。

其实他的方法就是常见的正则匹配,但是整个实现写的很精巧,非常值得 javascript 新手研究。

一个非常健全的 Javascript 链接(URL)解析类 – 示例

 
<script type="text/javascript">
 
// 说明:一个非常健全的 Javascript 链接(URL)解析类
// 整理:http://www.CodeBit.cn
 
/** 
* @projectDescription 	Poly9's polyvalent URLParser class
*
* @author	Denis Laprise - denis@poly9.com - http://poly9.com
* @version	0.1 
* @namespace	Poly9
*
* See the unit test file for more examples.
* URLParser is freely distributable under the terms of an MIT-style license.
*/
 
if (typeof Poly9 == 'undefined')
{
	var Poly9 = {};
}
 
/**
 * Creates an URLParser instance
 *
 * @classDescription	Creates an URLParser instance
 * @return {Object}	return an URLParser object
 * @param {String} url	The url to parse
 * @constructor
 * @exception {String}  Throws an exception if the specified url is invalid
 */
Poly9.URLParser = function(url) {
 
	this._fields = {
		'Username' : 4, 
		'Password' : 5, 
		'Port' : 7, 
		'Protocol' : 2, 
		'Host' : 6, 
		'Pathname' : 8, 
		'URL' : 0, 
		'Querystring' : 9, 
		'Fragment' : 10
	};
 
	this._values = {};
	this._regex = null;
	this.version = 0.1;
	this._regex = /^((w+)://)?((w+):?(w+)?@)?([^/?:]+):?(d+)?(/?[^?#]+)???([^#]+)?#?(w*)/;
 
	for(var f in this._fields)
	{
		this['get' + f] = this._makeGetter(f);
	}
 
	if (typeof url != 'undefined')
	{
		this._parse(url);
	}
}
 
/**
 * @method 
 * @param {String} url	The url to parse
 * @exception {String} 	Throws an exception if the specified url is invalid
 */
Poly9.URLParser.prototype.setURL = function(url) {
	this._parse(url);
}
 
Poly9.URLParser.prototype._initValues = function() {
	for(var f in this._fields)
	{
		this._values[f] = '';
	}
}
 
Poly9.URLParser.prototype._parse = function(url) {
	this._initValues();
	var r = this._regex.exec(url);
	if (!r) throw "DPURLParser::_parse -> Invalid URL";
 
	for(var f in this._fields) if (typeof r[this._fields[f]] != 'undefined')
	{
		this._values[f] = r[this._fields[f]];
	}
}
 
Poly9.URLParser.prototype._makeGetter = function(field) {
	return function() {
		return this._values[field];
	}
}
 
</script>

示例代码:

 
<script type="text/javascript">
 
var url = 'http://user:password@www.codebit.cn:9901/pub/article.php?offset=10&perpage=10#fragment';
 
var p = new Poly9.URLParser(url);
 
document.write("<strong>URL:</strong> " + url + "<br /><br />");
document.write("解析结果如下:<br /><br />");
document.write("<strong>Protocol:</strong> " + p.getProtocol() + "<br />");
document.write("<strong>Username:</strong> " + p.getUsername() + "<br />");
document.write("<strong>Password:</strong> " + p.getPassword() + "<br />");
document.write("<strong>Host:</strong> " + p.getHost() + "<br />");
document.write("<strong>Port:</strong> " + p.getPort() + "<br />");
document.write("<strong>Pathname:</strong> " + p.getPathname() + "<br />");
document.write("<strong>Query String:</strong> " + p.getQuerystring() + "<br />");
document.write("<strong>Fragment:</strong> " + p.getFragment() + "<br />");
 
</script>

用 Javascript 实现锚点(Anchor)间平滑跳转

锚点(Anchor)相信很多人都不陌生,它方便访问者在页面的不同位置快速跳转,直接找到自己感兴趣的内容,如果说 RSS 是整个网站的摘要,那锚点就是一个页面的摘要,通常一个页面内容很多的时候,都会用锚点来定位。

但是锚点也有个问题,通常点击锚点后,页面会立即跳到目标位置,而本文介绍的方法,实现了锚点(Anchor)间平滑跳转,效果非常不错。

用 Javascript 实现锚点(Anchor)间平滑跳转 – 示例

 
<script type="text/javascript">
 
// 说明 :用 Javascript 实现锚点(Anchor)间平滑跳转
// 来源 :ThickBox 2.1
// 整理 :Yanfu Xie [xieyanfu@yahoo.com.cn]
// 网址 :http://www.codebit.cn
// 日期 :07.01.17
 
// 转换为数字
function intval(v)
{
	v = parseInt(v);
	return isNaN(v) ? 0 : v;
}
 
// 获取元素信息
function getPos(e)
{
	var l = 0;
	var t  = 0;
	var w = intval(e.style.width);
	var h = intval(e.style.height);
	var wb = e.offsetWidth;
	var hb = e.offsetHeight;
	while (e.offsetParent){
		l += e.offsetLeft + (e.currentStyle?intval(e.currentStyle.borderLeftWidth):0);
		t += e.offsetTop  + (e.currentStyle?intval(e.currentStyle.borderTopWidth):0);
		e = e.offsetParent;
	}
	l += e.offsetLeft + (e.currentStyle?intval(e.currentStyle.borderLeftWidth):0);
	t  += e.offsetTop  + (e.currentStyle?intval(e.currentStyle.borderTopWidth):0);
	return {x:l, y:t, w:w, h:h, wb:wb, hb:hb};
}
 
// 获取滚动条信息
function getScroll() 
{
	var t, l, w, h;
	
	if (document.documentElement && document.documentElement.scrollTop) {
		t = document.documentElement.scrollTop;
		l = document.documentElement.scrollLeft;
		w = document.documentElement.scrollWidth;
		h = document.documentElement.scrollHeight;
	} else if (document.body) {
		t = document.body.scrollTop;
		l = document.body.scrollLeft;
		w = document.body.scrollWidth;
		h = document.body.scrollHeight;
	}
	return { t: t, l: l, w: w, h: h };
}
 
// 锚点(Anchor)间平滑跳转
function scroller(el, duration)
{
	if(typeof el != 'object') { el = document.getElementById(el); }
 
	if(!el) return;
 
	var z = this;
	z.el = el;
	z.p = getPos(el);
	z.s = getScroll();
	z.clear = function(){window.clearInterval(z.timer);z.timer=null};
	z.t=(new Date).getTime();
 
	z.step = function(){
		var t = (new Date).getTime();
		var p = (t - z.t) / duration;
		if (t >= duration + z.t) {
			z.clear();
			window.setTimeout(function(){z.scroll(z.p.y, z.p.x)},13);
		} else {
			st = ((-Math.cos(p*Math.PI)/2) + 0.5) * (z.p.y-z.s.t) + z.s.t;
			sl = ((-Math.cos(p*Math.PI)/2) + 0.5) * (z.p.x-z.s.l) + z.s.l;
			z.scroll(st, sl);
		}
	};
	z.scroll = function (t, l){window.scrollTo(l, t)};
	z.timer = window.setInterval(function(){z.step();},13);
}
 
</script>

调用方式:

 
scroller(el, duration)
 
el : 目标锚点 ID
duration : 持续时间,以毫秒为单位,越小越快
 
<style type="text/css">
div.test {
	width:400px;
	margin:5px auto;
	border:1px solid #ccc;
}
div.test strong {
	font-size:16px;
	background:#fff;
	border-bottom:1px solid #aaa;
	margin:0;
	display:block;
	padding:5px 0;
	text-decoration:underline;
	color:#059B9A;
	cursor:pointer;
}
div.test p {
	height:400px;
	background:#f1f1f1;
	margin:0;
}
 
</style>
 
<div class="test">
	<a name="header_1" id="header_1"></a>
	<strong onclick="javascript:scroller('header_4', 800);">header_1 --> header_4</strong>
	<p></p>
</div>
 
<div class="test">
	<a name="header_2" id="header_2"></a>
	<strong onclick="javascript:scroller('header_5', 800);">header_2 --> header_5</strong>
	<p></p>
</div>
 
<div class="test">
	<a name="header_3" id="header_3"></a>
	<strong onclick="javascript:scroller('header_6', 800);">header_3 --> header_6</strong>
	<p></p>
</div>
 
<div class="test">
	<a name="header_4" id="header_4"></a>
	<strong onclick="javascript:scroller('header_7', 800);">header_4 --> header_7</strong>
	<p></p>
</div>
 
<div class="test">
	<a name="header_5" id="header_5"></a>
	<strong onclick="javascript:scroller('header_3', 800);">header_5 --> header_3</strong>
	<p></p>
</div>
 
<div class="test">
	<a name="header_6" id="header_6"></a>
	<strong onclick="javascript:scroller('header_2', 800);">header_6 --> header_2</strong>
	<p></p>
</div>
 
<div class="test">
	<a name="header_7" id="header_7"></a>
	<strong onclick="javascript:scroller('header_1', 800);">header_7 --> header_1</strong>
	<p></p>
</div>