获取Url-Params

getUrlParams.js

//simple define fn 
//根据param name获取url中params的值
function getUrlParam(name) {
    var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");
    var r = window.location.search.substr(1).match(reg);
    if (r != null) {
      return unescape(r[2]);
    }
    return null;
}
//use it
var docId = getUrlParam('docid');
var env = getUrlParam('env');