系统日期格式转换

//1.系统日期转成时间戳
var date = new Date();
var time = date.getTime();

//2.系统日期转成2020/4/23 15:37:40
var date = new Date();
var time = `${date.getFullYear()}/${date.getMonth()+1}/${date.getDate()} ${date.getHours()}:${date.getMinutes()}:${date.getSeconds()}`

//3.系统日期获取星期几
var date = new Date();
var arr = ["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
var time = arr[date.getDay()];