复制代码 代码如下:

function changeURLPar(url, ref, value) {

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;

}