1.效果图

2.js代码

function beforetime1() {let now = new Date();//想获取前七天日期就减七，前六天就减六，以此类推var date = new Date(now.getTime() - 7 * 24 * 3600 * 1000);var y = date.getFullYear();var m = date.getMonth() + 1;m = m < 10 ? ('0' + m) : m;var d = date.getDate();d = d < 10 ? ('0' + d) : d;var h = date.getHours();h = h < 10 ? ('0' + h) : h;var minute = date.getMinutes();var second = date.getSeconds();minute = minute < 10 ? ('0' + minute) : minute;second = second < 10 ? ('0' + second) : second;// return y + '-' + m + '-' + d + ' ' + h + ':' + minute + ':' + second;//年月日时分秒// return y + '-' + m + '-' + d + ' ' + h + ':' + minute;return  m + '-' + d + ' ';
}