JavaScript对Cookie的增删改查

let username = 'Javan';
document.cookie = "name=" + username;

var cookieAll = document.cookie;
console.log(cookieAll);
// 输出后加工处理得到name值

function setCookie(name, value, days) {
  var exp = new Date();
  exp.setTime(exp.getTime() + days*24*60*60*1000);
  document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
}

function getCookie(name) {
  var arr, reg = new RegExp("(^| )" + name + "=([^;]*)(;|$)");
  if (arr = document.cookie.match(reg)) {
    return unescape(arr[2]);
  } else {
    return null;
  }
}

// 设置key为user, 值为Javanx
setCookie('user', 'Javanx', 1);
console.log(getCookie('user'));
// print Javanx

function delCookie(name) {
  var exp = new Date();
  exp.setTime(exp.getTime() - 1);
  var cval=getCookie(name);
  if (cval!=null) {
    document.cookie= name + "=" + cval + ";expires=" + exp.toGMTString();
  }
}