cookie的增删改查.js

/**
 * 设置cookie
 * @param {string} name  键名
 * @param {string} value 键值
 * @param {integer} days cookie周期
 */
function setCookie(name, value, days) {
    if (days) {
        var date = new Date();
        date.setTime(date.getTime()+(days * 24 * 60 * 60 * 1000));
        var expires = `; expires = ${date.toGMTString()}`;
    }else{
        var expires = "";
    }
    document.cookie = `name = ${value}${expires}; path=/`;
}
// 获取cookie
function getCookie(name) {
    var nameEQ = `${name}=`;
    var ca = document.cookie.split(';');
    for(var i = 0; i < ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') {
          c = c.substring(1, c.length);
        }
        if (c.indexOf(nameEQ) == 0) {
          return c.substring(nameEQ.length,c.length);
        }
    }
    return null;
}
// 删除cookie
function deleteCookie(name) {
    setCookie(name, "", -1);
}