js年月日替换成

function formatDate(date) {
    var year = date.getFullYear();
    var month = (date.getMonth() + 1).toString().padStart(2, '0'); // 月份是从0开始的，所以需要+1
    var day = date.getDate().toString().padStart(2, '0');

    return year + '-' + month + '-' + day;
}

var currentDate = new Date();
console.log(formatDate(currentDate)); // 输出格式化的日期，例如 "2023-07-06"

function replaceWithCustomString(date) {
    var year = date.getFullYear();
    var month = (date.getMonth() + 1).toString().padStart(2, '0');
    var day = date.getDate().toString().padStart(2, '0');

    return `今天是${year}年${month}月${day}日`;
}

var currentDate = new Date();
console.log(replaceWithCustomString(currentDate)); // 输出自定义格式的日期字符串，例如 "今天是2023年07月06日"

var dateString = "2023/07/06";
var formattedDate = dateString.replace(/(\d{4})\/(\d{2})\/(\d{2})/, '$1-$2-$3');
console.log(formattedDate); // 输出 "2023-07-06"