cookies 设置、获取

<script type="text/javascript">

//设置cookies

function setCookie(name,value,days){   

     var date = new Date();   

     date.setDate(date.getDate()+days);   

    document.cookie=name+"="+escape(value)+";expires="+date.toGMTString();

}

setCookie("aa","bb",7);

//获取cookies

function getCookie(name){   

     if (document.cookie.length>0){        

     var start = document.cookie.indexOf(name+"=");        

     if (start>=0){            

     var valueStart = start+name.length+1;            

     var valueEnd = document.cookie.indexOf(";",valueStart);     

     if (valueEnd == -1){         

     valueEnd = document.cookie.length;     

     }            

     var value = document.cookie.substring(valueStart,valueEnd);            

     return unescape(value);        

    }   

    }   

return " ";   

}

var dd = getCookie("aa");

alert(dd);

来源：https://www.cnblogs.com/qiuwenjuan/p/coolies.html