Example analysis of cookie plug-in usage in jQuery

Example analysis of cookie plug-in usage in jQuery_jquery

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Release： 2016-05-16 15:27:41

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本文实例讲述了jQuery中cookie插件用法。分享给大家供大家参考，具体如下：

Jquery里面提供了很多插件，方便，安全，快速实用。这节一起熟悉下JQUERY中操作Cookie的插件，插件名称为jquery.cookie.js，可以去官方网站下载。

下载地址： http://plugins.jquery.com/project/cookie.

插件主要报告如下几个用法

1.创建Cookie

创建一个名称为username,值为 admin的cookie ,如下

复制代码代码如下:

$.cookie('username',"admin");

当然cookie还包括路径，过期时间等其他参数，一起看下其他参数的用法

复制代码代码如下:

$.cookie('username', 'admin', {expires: 7, path: '/', domain: 'jquery.com', secure: true});

expires:表示过期时间，默认为天，如上表示过期时间为7天,如果省略过期时间，表示关闭浏览器时候，cookie将被删除

也可以设置cookie的过期时间,如下设置3分钟后过期

var dt= new date();
dt.settime(date.gettime() + (3* 60 * 1000));
$.cookie('username', 'admin', { expires: dt});

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path:定义cookie的有效路径，默认情况下路径为创建cookie网页所在的路径，如果想让整个网站访问到，路径设置为path: '/'

domain：设置cookie所在的域

secure: 如果为true表示cookie的传输需要使用https安全协议，默认为false

2.删除Cookie

可以使用两种方法

$.removeCookie("username");
$.cookie('username',"null");

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3.读取cookie

复制代码代码如下:

var account = $.cookie('username');

如果没有写入cookie，读取到的值为undefined

附：jquery.cookie.js完整代码如下：

/*!
 * jQuery Cookie Plugin v1.4.1
 * https://github.com/carhartl/jquery-cookie
 *
 * Copyright 2006, 2014 Klaus Hartl
 * Released under the MIT license
 */
(function (factory) {
  if (typeof define === 'function' && define.amd) {
    // AMD (Register as an anonymous module)
    define(['jquery'], factory);
  } else if (typeof exports === 'object') {
    // Node/CommonJS
    module.exports = factory(require('jquery'));
  } else {
    // Browser globals
    factory(jQuery);
  }
}(function ($) {
  var pluses = /\+/g;
  function encode(s) {
    return config.raw &#63; s : encodeURIComponent(s);
  }
  function decode(s) {
    return config.raw &#63; s : decodeURIComponent(s);
  }
  function stringifyCookieValue(value) {
    return encode(config.json &#63; JSON.stringify(value) : String(value));
  }
  function parseCookieValue(s) {
    if (s.indexOf('"') === 0) {
      // This is a quoted cookie as according to RFC2068, unescape...
      s = s.slice(1, -1).replace(/\\"/g, '"').replace(/\\\\/g, '\\');
    }
    try {
      // Replace server-side written pluses with spaces.
      // If we can't decode the cookie, ignore it, it's unusable.
      // If we can't parse the cookie, ignore it, it's unusable.
      s = decodeURIComponent(s.replace(pluses, ' '));
      return config.json &#63; JSON.parse(s) : s;
    } catch(e) {}
  }
  function read(s, converter) {
    var value = config.raw &#63; s : parseCookieValue(s);
    return $.isFunction(converter) &#63; converter(value) : value;
  }
  var config = $.cookie = function (key, value, options) {
    // Write
    if (arguments.length > 1 && !$.isFunction(value)) {
      options = $.extend({}, config.defaults, options);
      if (typeof options.expires === 'number') {
        var days = options.expires, t = options.expires = new Date();
        t.setMilliseconds(t.getMilliseconds() + days * 864e+5);
      }
      return (document.cookie = [
        encode(key), '=', stringifyCookieValue(value),
        options.expires &#63; '; expires=' + options.expires.toUTCString() : '', // use expires attribute, max-age is not supported by IE
        options.path &#63; '; path=' + options.path : '',
        options.domain &#63; '; domain=' + options.domain : '',
        options.secure &#63; '; secure' : ''
      ].join(''));
    }
    // Read
    var result = key &#63; undefined : {},
      // To prevent the for loop in the first place assign an empty array
      // in case there are no cookies at all. Also prevents odd result when
      // calling $.cookie().
      cookies = document.cookie &#63; document.cookie.split('; ') : [],
      i = 0,
      l = cookies.length;
    for (; i < l; i++) {
      var parts = cookies[i].split('='),
        name = decode(parts.shift()),
        cookie = parts.join('=');
      if (key === name) {
        // If second argument (value) is a function it's a converter...
        result = read(cookie, value);
        break;
      }
      // Prevent storing a cookie that we couldn't decode.
      if (!key && (cookie = read(cookie)) !== undefined) {
        result[name] = cookie;
      }
    }
    return result;
  };
  config.defaults = {};
  $.removeCookie = function (key, options) {
    // Must not alter options, thus extending a fresh object...
    $.cookie(key, '', $.extend({}, options, { expires: -1 }));
    return !$.cookie(key);
  };
}));

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希望本文所述对大家jQuery程序设计有所帮助。