js 对cookie的操作

 

设置cookie
document.cookie="name="+username;

function setCookie(name,value)
{
    var Days = 30;
    var exp = new Date();
    exp.setTime(exp.getTime() + Days*24*60*60*1000);
    document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
}

获取cookie
function getCookie(name)
{
    var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");
    if(arr=document.cookie.match(reg))
        return unescape(arr[2]);
    else
        return null;
}


删除cookie
function delCookie(name)
{
    var exp = new Date();
    exp.setTime(exp.getTime() - 1);
    var cval=getCookie(name);
    if(cval!=null)
        document.cookie= name + "="+cval+";expires="+exp.toGMTString();
}

删除所有cookie
function delCookie () {
  var keys = document.cookie.match(/[^ =;]+(?==)/g)
  if (keys) {
    for (var i = keys.length; i--;) {
      document.cookie = keys[i] + '=0;path=/;expires=' + new Date(0).toUTCString() // 清除当前域名下的,例如：m.ratingdog.cn
      document.cookie = keys[i] + '=0;path=/;domain=' + document.domain + ';expires=' + new Date(0).toUTCString() // 清除当前域名下的，例如 .m.ratingdog.cn
      document.cookie = keys[i] + '=0;path=/;domain=ratingdog.cn;expires=' + new Date(0).toUTCString() // 清除一级域名下的或指定的，例如 .ratingdog.cn
    }
  }
}