jquery读写cookie操作实例分析

jQuery.cookie = function(name, value, options) {if (typeof value != 'undefined') {  options = options || {};  if (value === null) {  value = '';  options = $.extend({}, options);  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;}};

$.cookie("name"); //根据cookie名字取到cookie值$.cookie("name", "value");//设置cookie 名字，值$.cookie("name", value, { expires: 7 }); //设置cookie 名字，值，生命周期等属性$.cookie("name", null); //根据cookie名移除cookie