url操作等

取得url ?及以前：

baseUrl = url.substr(0,url.indexOf('?')+1)

searchParam = searchParam.slice(0, -1);//去掉最后一位

$("ul.nav").on("click","li",function(e){
   var href = "#"+$(this).attr("tag");
   window.location.href =  href;
})
window.location.href = "#2"//页面不刷新，替换hash
window.location.href = "?a=1"//页面刷新，替换search