js操作浏览器的参数方法

function getQueStr(url, ref) //取获参数值{  var str = url.substr(url.indexOf('?') + 1);  if (str.indexOf('&') != -1) {    var arr = str.split('&');    for (i in arr) {      if (arr[i].split('=')[0] == ref)        return arr[i].split('=')[1];    }  }  else {    return url.substr(url.indexOf('=') + 1)  }}function setQueStr(url, ref, value) //设置参数值{  var str = "";  if (url.indexOf('?') != -1)    str = url.substr(url.indexOf('?') + 1);  else    return url + "?" + ref + "=" + value;  var returnurl = "";  var setparam = "";  var arr;  var modify = "0";  if (str.indexOf('&') != -1) {    arr = str.split('&');    for (i in arr) {      if (arr[i].split('=')[0] == ref) {        setparam = value;        modify = "1";      }      else {        setparam = arr[i].split('=')[1];      }      returnurl = returnurl + arr[i].split('=')[0] + "=" + setparam + "&";    }    returnurl = returnurl.substr(0, returnurl.length - 1);    if (modify == "0")      if (returnurl == str)        returnurl = returnurl + "&" + ref + "=" + value;  }  else {    if (str.indexOf('=') != -1) {      arr = str.split('=');      if (arr[0] == ref) {        setparam = value;        modify = "1";      }      else {        setparam = arr[1];      }      returnurl = arr[0] + "=" + setparam;      if (modify == "0")        if (returnurl == str)          returnurl = returnurl + "&" + ref + "=" + value;    }    else      returnurl = ref + "=" + value;  }  return url.substr(0, url.indexOf('?')) + "?" + returnurl;}function delQueStr(url, ref) //删除参数值{  var str = "";  if (url.indexOf('?') != -1)    str = url.substr(url.indexOf('?') + 1);  else    return url;  var arr = "";  var returnurl = "";  var setparam = "";  if (str.indexOf('&') != -1) {    arr = str.split('&');    for (i in arr) {      if (arr[i].split('=')[0] != ref) {        returnurl = returnurl + arr[i].split('=')[0] + "=" + arr[i].split('=')[1] + "&";      }    }    return url.substr(0, url.indexOf('?')) + "?" + returnurl.substr(0, returnurl.length - 1);  }  else {    arr = str.split('=');    if (arr[0] == ref)      return url.substr(0, url.indexOf('?'));    else      return url;  }}