在php中设置cookie.

$email="abc@163.com";setcookie("y_email",$email,time()+3600,"/");

js中获取cookie

function getCookie(c_name){if (document.cookie.length>0)  {  c_start=document.cookie.indexOf(c_name + "=")  if (c_start!=-1)    {     c_start=c_start + c_name.length+1     c_end=document.cookie.indexOf(";",c_start)    if (c_end==-1) c_end=document.cookie.length    return unescape(document.cookie.substring(c_start,c_end))    }   }return "";}var y_email=getCookie('y_email');

php中让cookie失效

setcookie("y_email","",time()-3600,"/");