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; ???????} ???} ???}