Javascript Examplet - A javascript class for retrieving query string

This "Javascript examplet" is extracted from article "A javascript class for retrieving query string" from Cloudgen's Javascript Laboratory

Statement of Goal

To retreive the host, path, protocol and query strings by constructing a Javascript Url Class

Snippet:

The following is the source code of the snippet. Click the link for downloading the snippet.

<script type="text/javascript">
function Url(a){this.setUrl(a)}
Url.prototype.setUrl=function(a){
	var undefined,d,c,b,h,e,i,f,g,j;
	this.queryString={};
	this.url=a;
	if(typeof a!="undefined") {
		this.host=this.file=this.path=undefined;
		if((c=a.indexOf("?"))==-1) b=a;
		else {
			b=a.substr(0,c);
			d=((e=a.indexOf("#"))==-1?a.substr(c+1):a.substr(c+1,e-c-1)+"&"+a.substr(e+1)).split("&");
			for(c=0;c<d.length;c++){
				i=d[c].indexOf("=");
				if(i>-1){
					f=d[c].substring(0,i);
					g=d[c].substring(i+1);
					this.queryString[f]=unescape(g.replace(/\+/g," "))
		}	}	}
		h=b.replace(/^(https?|ftp):\/\/[^\/]+/,function(s){j=s;return ""}).split("/");
		this.file=h.pop();
		this.host=j;
		this.path="/"+(h.length>0?h.join("/"):"");
	}
}
</script>

Application Note:

The following is the application code of the snippet.

<script type="text/javascript">
var myUrl=new Url("http://www.google.com.hk/search?source=ig&hl=zh-TW&q=abc&meta=lr%3D&btnG=Google+Hello&aq=f&oq=");
document.write("host:"+myUrl.host+"<"+"br/>");
document.write("path:"+myUrl.path+"<"+"br/>");
document.write("file:"+myUrl.file+"<"+"br/>");
document.write(myUrl.queryString.hl+"<"+"br/>");
document.write(myUrl.queryString.source+"<"+"br/>");
document.write(myUrl.queryString.q+"<"+"br/>");
document.write(myUrl.queryString.btnG+"<"+"br/>");
</script>

Output: