jquery实现的cookie操作插件

jQuery.cookie=function(name, value, options){
  if(typeof value != ‘undefined‘){ 
    options=options||{};
    if(value === null){
      value=‘‘;
      options.expires=-1;
    }
    var expires=‘‘;
    if(options.expires&&(typeof options.expires==‘number‘||options.expires.toUTCString)){
      var date;
      if(typeof options.expires==‘number‘){
        date=new Date();
        date.setTime(date.getTime()+(options.expires * 24 * 60 * 60 * 1000));
      } 
      else{
         date = options.expires;
      }
      expires= ‘; expires=‘ + date.toUTCString(); 
    }
    var path = options.path ? ‘; path=‘ + (options.path) : ‘‘;
    var domain = options.domain ? ‘; domain=‘ + (options.domain) : ‘‘;
    var secure = options.secure ? ‘; secure‘ : ‘‘;
    document.cookie = [name, ‘=‘, encodeURIComponent(value), expires, path, domain, secure].join(‘‘);
  } 
  else{
    var cookieValue = null;
    if(document.cookie && document.cookie != ‘‘){
      var cookies = document.cookie.split(‘;‘);
      for (var i = 0; i < cookies.length; i++){
        var cookie = jQuery.trim(cookies[i]);
        if (cookie.substring(0, name.length + 1) == (name + ‘=‘)){
          cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
          break;
        }
      }
    }
    return cookieValue;
  }
}