今天遇到一个需要用javascript将url中的某些参数替换的需求，想起了不久前从网上淘到了一个parseUrl函数，正好可以借此实现，代码整理如下：
复制代码 代码如下:
//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 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