js 获取 参数

function getQueryVariable(variable)
    {
         var query = window.location.search.substring(1);
         var vars = query.split("&");
         for (var i=0;i<vars.length;i++)
        {
             var pair = vars[i].split("=");
             if (pair[0] == variable)
             {
                 return unescape(pair[1]);
             }
         }
         //alert('Query Variable ' + variable + ' not found');
    }