cookie 使用方法

//写cookies
setCookie: function(name, value) {
let days = 1
let exp = new Date()
exp.setTime(exp.getTime() + days * 24 * 60 * 60 * 1000)
document.cookie = name + ‘=‘ + escape (value) + ‘;expires=‘ + exp.toGMTString()
},
//读取cookies
readCookie: function (name) {
let arr = null
let reg = new RegExp(‘(^| )‘+name+‘=([^;]*)(;|$)‘)
if (document.cookie && (arr = document.cookie.match(reg))) {
return unescape(arr[2])
} else {
return null;
}
},
//删除cookies
delCookie: function (name) {
let cval = this.readCookie(name)
if (cval!=null) {
document.cookie = name + ‘=‘ + cval + ‘;expires=‘ + (new Date(0)).toGMTString()
}
}