一个简单的js获取url参数的函数

/***
获取URL指定参数
***/
function getParam(paramName)
{
paramValue = "";
isFound = false;
if (this.location.search.indexOf("?") == 0 && this.location.search.indexOf("=")>1)
{
arrSource = unescape(this.location.search).substring(1,this.location.search.length).split("&");
i = 0;
while (i < arrSource.length && !isFound)
{
if (arrSource[i].indexOf("=") > 0)
{
if (arrSource[i].split("=")[0].toLowerCase()==paramName.toLowerCase())
{
paramValue = arrSource[i].split("=")[1];
isFound = true;
}
}
i++;
}
}
return paramValue;
}