JS使用cookie设置样式的方法

var styleShow = ["blackgreen", "purple"];var path = "/";var StyleSwitch = {  //设置样式  setStyleSheet: function (StyleName) {    var i, a, main;    for (i = 0; (a = document.getElementsByTagName("link")[i]); i++) {      if (a.getAttribute("rel").indexOf("Style") != -1 && a.getAttribute("title")) {        a.disabled = true;        if (a.getAttribute("title") == StyleName) {          a.disabled = false;          this.setCookie("Style", StyleName);        }      }    }  },  //获取当前使用样式  getStyleSheet: function () {    var i, a;    for (i = 0; (a = document.getElementsByTagName("link")[i]); i++) {      if (a.getAttribute("rel").indexOf("Style") != -1 && a.getAttribute("title") && !a.disabled) {        return a.getAttribute("title");      }    }    return null;  },  //获取默认样式  getPreferredStyleSheet: function () {    var i, a;    for (i = 0; (a = document.getElementsByTagName("link")[i]); i++) {      if (a.getAttribute("rel").indexOf("Style") != -1    && a.getAttribute("rel").indexOf("alt") == -1    && a.getAttribute("title")    ) {        return a.getAttribute("title");      }    }    return null;  },  //获取cookie  getCookie: function (name) {    var cookieName = encodeURIComponent(name) + "=",    cookieStart = document.cookie.indexOf(cookieName),    cookieValue = null;    if (cookieStart > -1) {      var cookieEnd = document.cookie.indexOf(";", cookieStart);      if (cookieStart == -1) {        alert(-2);        cookieEnd = document.cookie.length;      }      cookieValue = decodeURIComponent(document.cookie.substring(cookieStart + cookieName.length, cookieEnd));    }    for (var i = 0; i < styleShow.length; i++) {      if (cookieValue == styleShow[i]) {        alert(styleShow[i]);        return styleShow[i];      }    }    return styleShow[0];  },  //生成cookie  //name cookie名  //value 值  //expires 过期时间  //path 路径  setCookie: function (name, value, expires, path, domain, secure) {    var cookieText = encodeURIComponent(name) + "=" + encodeURIComponent(value) + ";";    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;  },  //重置cookie  unsetCookie: function (name, path, domain, secure) {    this.set(name, "", new Date(0), path, domain, screen);  }};