Cookie是网站设计者放置在客户端的小文本文件，一般后台语言使用的比较多，可以实现用户个性化的一些需求。js-cookie插件是一个JS操作cookie的插件，源文件只有3.34 KB，非常轻量级。js-cookie也支持npm和Bower安装和管理。下面看看js-cookie的具体用法。

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A simple, lightweight JavaScript API for handling cookies

Works in all browsers
Accepts any character
Heavily tested
No dependency
Unobtrusive JSON support
Supports AMD/CommonJS
RFC 6265 compliant
Useful Wiki
Enable custom encoding/decoding
~900 bytes gzipped!

引用方法:

1、引入js-cookie.js

1.直接饮用cdn：

2.本地下载下来后：

3.模块化开发时: import Cookies from 'js-cookie'

2、js-cookie.js常用的API和方法

a、设置cookie

Cookies.set('name', 'value', { expires: 7, path: '' });//7天过期

Cookies.set('name', { foo: 'bar' });//设置一个json

b、读取cookie

Cookies.get('name');//获取cookie

Cookies.get(); #读取所有的cookie

c、删除cookie

Cookies.remove('name'); #删除cookie时必须是同一个路径。

下面是国外的介绍

Basic Usage

Create a cookie, valid across the entire site:

Cookies.set('name', 'value');

Create a cookie that expires 7 days from now, valid across the entire site:

Cookies.set('name', 'value', { expires: 7 });

Create an expiring cookie, valid to the path of the current page:

Cookies.set('name', 'value', { expires: 7, path: '' });

Read cookie:

Cookies.get('name'); // => 'value'
Cookies.get('nothing'); // => undefined

Read all visible cookies:

Cookies.get(); // => { name: 'value' }

Delete cookie:

Cookies.remove('name');

Delete a cookie valid to the path of the current page:

Cookies.set('name', 'value', { path: '' });
Cookies.remove('name'); // fail!
Cookies.remove('name', { path: '' }); // removed!

IMPORTANT! When deleting a cookie, you must pass the exact same path and domain attributes that were used to set the cookie, unless you're relying on the default attributes.

Note: Removing a nonexistent cookie does not raise any exception nor return any value.

Namespace conflicts

If there is any danger of a conflict with the namespace Cookies, the noConflict method will allow you to define a new namespace and preserve the original one. This is especially useful when running the script on third party sites e.g. as part of a widget or SDK.

// Assign the js-cookie api to a different variable and restore the original "window.Cookies"

var Cookies2 = Cookies.noConflict();
Cookies2.set('name', 'value');

Note: The .noConflict method is not necessary when using AMD or CommonJS, thus it is not exposed in those environments.

JSON

js-cookie provides unobtrusive JSON storage for cookies.

When creating a cookie you can pass an Array or Object Literal instead of a string in the value. If you do so, js-cookie will store the string representation of the object according to JSON.stringify:

Cookies.set('name', { foo: 'bar' });

When reading a cookie with the default Cookies.get api, you receive the string representation stored in the cookie:

Cookies.get('name'); // => '{"foo":"bar"}'
Cookies.get(); // => { name: '{"foo":"bar"}' }

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