JS設定時間格式為2010-01-01，以及時間加減

function formatDate(date){  
let year = date.getFullYear(); 
 let month = date.getMonth()+1; 
 let day = date.getDate(); 
 month = month < 10 ?'0'+ month : month;  
day = day < 10 ?'0'+ day : day;  return year +'-'+ month +'-'+ day;
}console.log(formatDate(new Date()));

//加7天 
var d = new Date();
d.setDate(d.getDate() + 7);
 $("#txtEndTime").val(formatDate(d));

//加一年 
var d = new Date();
d.setFullYear(d.getFullYear()+1);
$("#txtEndTime").val(formatDate(d));