var atr = 'http://item.taobao.com/item.html?a=1';

function geturlJson () {

var datastr = atr.split("?")[1];

console.log(datastr)

var result = {};

if(datastr.indexOf("&") > 0 ){

var bigarr = datastr.split("&");

console.log(bigarr)

for (var i= 0 ;i<bigarr.length;i++){

var smallarr= bigarr[i].split("=");

result[smallarr[0]] = smallarr[1];

}

}else{

var arrr= datastr.split("=");

result[arrr[0]] = arrr[1];

console.log(result)

}

return result;

}

geturlJson()