从浏览器的url中获取查询字符串的参数

正则表达式：

 function getQuery(name){
     var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");
     var r = window.location.search.substr(1).match(reg);
     if(r != null)
         return decodeURI(r[2]);
     return null;
 }

截取：

 function fn() {
     var url = decodeURI(window.location.href);
     var args = url.split('?');
     if (args[0] === url)
         return false;
     var arr = args[1].split('&');
     var obj = {};
     for (var i = 0; i < arr.length; i++) {
         var arg = arr[i].split('=');
         obj[arg[0]] = arg[1];
     }
     return obj;
 }