javascript操作cookie代码封装

对于cookie的操作无非就是设置、获取或者删除等操作。

如果将这些操作都封装在一起，那么使用起来非常的方便。

代码实例如下:

var CookieUtil = {
  //根据key读取cookie
  get: function (name) {
    //注意对键编码
    var cookieName = encodeURIComponent(name) + "=",
        cookieStart = document.cookie.indexOf(cookieName),
        cookieValue = null,
        cookieEnd;
    //找到cookie键   
    if (cookieStart > -1) {
      //键后面第一个分号位置
      cookieEnd = document.cookie.indexOf(";", cookieStart);
      if (cookieEnd == -1) {
        cookieEnd = document.cookie.length;
      }
      //cookie值解码
      cookieValue = decodeURIComponent(document.cookie.substring(cookieStart + cookieName.length, cookieEnd));
    }
    return cookieValue;
  },
  //设置cookie
  set: function (name, value, expires, path, domain, secure) {
    var cookieText = encodeURIComponent(name) + "=" + encodeURIComponent(value);
    //失效时间，GMT时间格式
    if (expires instanceof Date) {
      cookieText += "; expires=" + expires.toGMTString();
    }
    if (path) {
      cookieText += "; path=" + path;
    }
    if (domain) {
      cookieText += "; domain=" + domain;
    }
    if (secure) {
      cookieText += "; secure";
    }
    document.cookie = cookieText;
  },
  //删除cookie，保持相同的键、域、路径、安全选项，然后设置失效时间即可
  unset: function (name, path, domain, secure) {
    this.set(name, "", new Date(0), path, domain, secure);
  }
};