使用js简单封装一个cookie

好的，下面是一个简单的封装 cookie 的 JavaScript 代码：

const CookieUtil = {
  // 获取指定名称的 cookie 值
  get: function (name) {
    let cookieName = encodeURIComponent(name) + "="
    let cookieStart = document.cookie.indexOf(cookieName)
    let cookieValue = null
    if (cookieStart > -1) {
      let cookieEnd = document.cookie.indexOf(";", cookieStart)
      if (cookieEnd == -1) {
        cookieEnd = document.cookie.length
      }
      cookieValue = decodeURIComponent(document.cookie.substring(cookieStart + cookieName.length, cookieEnd))
    }
    return cookieValue
  },
  
  // 设置 cookie 值
  set: function (name, value, expires, path, domain, secure) {
    let 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
  },
  
  // 删除指定名称的 cookie
  unset: function (name, path, domain, secure) {
    this.set(name, "", new Date(0), path, domain, secure)
  }
}

使用方法：

// 设置 cookie
CookieUtil.set("username", "jack")

// 获取 cookie
let username = CookieUtil.get("username")

// 删除 cookie
CookieUtil.unset("username")

希望对你有所帮助！