//创建cookie

function setCookie(name, value, expires, path, domain, secure) {

    var cookieText = encodeURIComponent(name) + '=' + encodeURIComponent(value);

    if (expires instanceof Date) {

        cookieText += '; expires=' + expires;

    }

    if (path) {

        cookieText += '; expires=' + expires;

    }

    if (domain) {

        cookieText += '; domain=' + domain;

    }

    if (secure) {

        cookieText += '; secure';

    }

    document.cookie = cookieText;

}

//获取cookie

function getCookie(name) {

    var cookieName = encodeURIComponent(name) + '=';

    var cookieStart = document.cookie.indexOf(cookieName);

    var cookieValue = null;

    if (cookieStart > -1) {

        var cookieEnd = document.cookie.indexOf(';', cookieStart);

        if (cookieEnd == -1) {

            cookieEnd = document.cookie.length;

        }

function arr1() {

  var n = []; //一个新的临时数组

  for (var i = 0; i < this.length; i++) //遍历当前数组

  {

    //如果当前数组的第i已经保存进了临时数组，那么跳过，

    //否则把当前项push到临时数组里面

    if (n.indexOf(this[i]) == -1) n.push(this[i]);

  }

  return n;

}

function arr2(){

    var n = {},r=[]; //n为hash表，r为临时数组

    for(var i = 0; i < this.length; i++) //遍历当前数组

    {

        if (!n[this[i]]) //如果hash表中没有当前项

        {

            n[this[i]] = true; //存入hash表

            r.push(this[i]); //把当前数组的当前项push到临时数组里面

        }

    }

    return r;

}

function arr3(){

    var n = [this[0]]; //结果数组

    for(var i = 1; i < this.length; i++) //从第二项开始遍历

    {

        //如果当前数组的第i项在当前数组中第一次出现的位置不是i，

        //那么表示第i项是重复的，忽略掉。否则存入结果数组

        if (this.indexOf(this[i]) == i) n.push(this[i]);

    }

    return n;

}