将下面代码按照新版php变量声明修改function runTime var d = new Date str = ; BirthDay = new Date2022-1-3; today = new Date; timeold = todaygetTime - BirthDaygetTime; sectimeold = timeold 1000 secon

function runTime() { let d = new Date(); let str = ''; let BirthDay = new Date("2022-1-3"); let today = new Date(); let timeold = (today.getTime() - BirthDay.getTime()); let sectimeold = timeold / 1000; let secondsold = Math.floor(sectimeold); let msPerDay = 24 * 60 * 60 * 1000; let msPerYear = 365 * 24 * 60 * 60 * 1000; let e_daysold = timeold / msPerDay; let e_yearsold = timeold / msPerYear; let daysold = Math.floor(e_daysold); let yearsold = Math.floor(e_yearsold); //str = yearsold + "年"; str += daysold + "天"; str += d.getHours() + '时'; str += d.getMinutes() + '分'; str += d.getSeconds() + '秒'; return str;