// 获取当前窗口url中param参数的值 function get_param(param){     var query = location.search.substring(1).split('&');     for(var i=0;i<query.length;i++){         var kv = query[i].split('=');         if(kv[0] == param){             return kv[1];         }     }     return null; } // 设置当前窗口url中param的值 function set_param(param,value){     var query = location.search.substring(1);     var p = new RegExp("(^|&"+param+")=[^&]*");     if(p.test(query)){         query = query.replace(p,"$1="+value);         location.search = '?'+query;     }else{         if(query == ''){             location.search = '?'+param+'='+value;         }else{             location.search = '?'+query+'&'+param+'='+value;         }     }    }

// 上一页 function page_pre(current_page,page_total){     if(current_page <= 1 || current_page > page_total){         return false;     }     var pre_page = parseInt(current_page) - 1;     set_param('page',pre_page); } // 下一页 function page_next(current_page,page_total){     if(current_page < 1 || current_page >= page_total){         return false;     }     var next_page = parseInt(current_page) + 1;     set_param('page',next_page); }