1、设定指定cookie值

const setCookie = (key, value, t) => {
    let oDate = new Date();
    oDate.setDate(oDate.getDate() + t);
    document.cookie = key + "=" + value + "; expires=" + oDate.toDateString();
}

2、获取指定cookie值

const getCookie = (name) => {
    let arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));
    if (arr != null) return unescape(arr[2]);
    return null;
}
// 或者
const getCookie = (key) => {
    let arr1 = document.cookie.split("; ");//由于cookie是通过一个分号+空格的形式串联起来的，所以这里需要先按分号空格截断,变成[name=Jack,pwd=123456,age=22]数组类型；
    for (let i = 0; i < arr1.length; i++) {
        let arr2 = arr1[i].split("=");//通过=截断，把name=Jack截断成[name,Jack]数组；
        if (arr2[0] == key) {
            return decodeURI(arr2[1]);
        }
    }
}

3、移除指定cookie值

const removeCookie = (key) => {
    setCookie(key, "", -1);//把cookie设置为过期
}