Get address bar parameters such as index.asp?id=xxx&name=xxx in JavaScript

JavaScript, like index.asp?id=xxx&name=xxx.

How can I use JavaScript to get the value of ID's name?
Method One:
<script>
function GetValue (name)
{
var Str=window.location.search;
if (str.indexof (name)!=-1)
{
var pos_start=str.indexof (name) +name.length+1;
var pos_end=str.indexof ("&", Pos_start);
if (pos_end==-1)
{
Return str.substring (Pos_start);
}
Else
{
Return str.substring (Pos_start,pos_end)
}
}
Else
{
Return "does not have this name value";
}
}
var strname=prompt ("Please enter the name of the value you want");
Alert (GetValue (strName));
</script>

Method Two:

This is done in the Ewebeditor online editor for you to refer to:
var urlparams = new Array ();
var aparams = document.location.search.substr (1). Split (' & ');
for (i=0 i < aparams.length i++) {
var aparam = aparams.split (' = ');
Urlparams[aparam[0]] = aparam[1];
}

Gets the name parameter passed over
name=urlparams["Name"];

Method Three:
<script type= "Text/javascript" >
Request = {
Querystring:function (item) {
var svalue = Location.search.match (New RegExp ("[\?\&]" + Item + "= ([^\&]*) (\&?)", "I"));
Return svalue? SVALUE[1]: svalue;
}
}
Alert (Request.QueryString ("id"));
</script>