//分析url
  function parseURL(url) {
      var a = document.createElement('a');
      a.href = url;
      return {
          source: url,
          protocol: a.protocol.replace(':', ''),
          host: a.hostname,
          port: a.port,
          query: a.search,
          params: (function () {
              var ret = {},
              seg = a.search.replace(/^\?/, '').split('&'),
              len = seg.length, i = 0, s;
              for (; i < len; i++) {
                  if (!seg[i]) { continue; }
                  s = seg[i].split('=');
                  ret[s[0]] = s[1];
              }
              return ret;

          })(),
          file: (a.pathname.match(/\/([^\/?#]+)$/i) || [, ''])[1],
          hash: a.hash.replace('#', ''),
          path: a.pathname.replace(/^([^\/])/, '/$1'),
          relative: (a.href.match(/tps?:\/\/[^\/]+(.+)/) || [, ''])[1],
          segments: a.pathname.replace(/^\//, '').split('/')
      };
  }

  //替换myUrl中的同名参数值
  function replaceUrlParams(myUrl, newParams) {
      /*
      for (var x in myUrl.params) {
          for (var y in newParams) {
              if (x.toLowerCase() == y.toLowerCase()) {
                  myUrl.params[x] = newParams[y];
              }
          }
      }
      */

      for (var x in newParams) {
          var hasInMyUrlParams = false;
    for (var y in myUrl.params) {
        if (x.toLowerCase() == y.toLowerCase()) {
            myUrl.params[y] = newParams[x];
            hasInMyUrlParams = true;
            break;
        }
    }
          //原来没有的参数则追加
    if (!hasInMyUrlParams) {
        myUrl.params[x] = newParams[x];
          }
}
      var _result = myUrl.protocol + "://" + myUrl.host + ":" + myUrl.port + myUrl.path + "?";

      for (var p in myUrl.params) {
          _result += (p + "=" + myUrl.params[p] + "&");
      }

      if (_result.substr(_result.length - 1) == "&") {
          _result = _result.substr(0, _result.length - 1);
      }

      if (myUrl.hash != "") {
          _result += "#" + myUrl.hash;
      }
      return _result;
  }

  //辅助输出
  function w(str) {
      document.write(str + "<br>");
  }

  var myURL = parseURL('http://abc.com:8080/dir/index.html?id=255&m=hello#top');
  w("myUrl.file = " + myURL.file)     // = 'index.html'
  w("myUrl.hash = " + myURL.hash)     // = 'top'
  w("myUrl.host = " + myURL.host)     // = 'abc.com'
  w("myUrl.query = " + myURL.query)    // = '?id=255&m=hello'
  w("myUrl.params = " + myURL.params)   // = Object = { id: 255, m: hello }
  w("myUrl.path = " + myURL.path)     // = '/dir/index.html'
  w("myUrl.segments = " + myURL.segments) // = Array = ['dir', 'index.html']
  w("myUrl.port = " + myURL.port)     // = '8080'
  w("myUrl.protocol = " + myURL.protocol) // = 'http'
  w("myUrl.source = " + myURL.source)   // = 'http://abc.com:8080/dir/index.html?id=255&m=hello#top'

  var _newUrl = replaceUrlParams(myURL, { id: 101, m: "World", page: 1,"page":2 });

  w("<br>新url为：")
  w(_newUrl); //http://abc.com:8080/dir/index.html?id=101&m=World&page=2#top   

via 用javascript替换URL中的参数值