获取 url 参数

 1 function getUrlParam(sUrl, sKey) {
 2     var result = {};
 3     sUrl.replace(/\??(\w+)=(\w+)&?/g,function(a,k,v){
 4         if(result[k] !== void 0){
 5             var t = result[k];
 6             result[k] = [].concat(t,v);
 7         }else{
 8             result[k] = v;
 9         }
10     });
11     if(sKey === void 0){
12         return result;
13     }else{
14         return result[sKey] || ‘‘;
15     }
16 }