3-localStorage、sessionStorage、cookie

cookies local Storage 可以在任意窗口访问

sessionStorage只能在当前标签页访问

cookies的过期时间可以手动设置

localStorage是永远不过期的

SessionStorage在标签页关闭后过期

读取cookie

document.cookie

设置cookie

document.cookie = "name = Tom"

设置localStorage

localStorage.setItem('早餐','牛奶')

读取localStorage

localStorage.getItem('早餐')

删除localStorage

localStorage.removeItem('早餐')

全部删除localStorage

localStorage.clear()

设置SessionStorage

设置相同的键名key会进行替换

SessionStorage.setItem('午餐','披萨')

读取SessionStorage

SessionStorage.getItem('午餐')