题解 | #模板字符串#

var person = {
level: '2',
name: '小丽',
registTime: '2021-11-01',
}
var h2 = document.querySelector('h2');
// 补全代码
let differenceDay = Math.floor((Date.now() - Date.parse(person.registTime)) / 8.64e+7)
h2.innerHTML = `尊贵的牛客网${person.level}级用户${person.name}您好，您已经注册牛客网${differenceDay}天啦~`