您可以创建自己的函数，如下所示

function toString(o, regex) {
    try {
        if (!o) return '';
        if (typeof o.getMonth === 'function' && !!regex) {
            let splitChar = regex.indexOf('/') > -1 ? '/' : regex.indexOf('-') > -1 ? '-' : regex.indexOf('.') > -1 ? '.' : '';
            let dateSeparate = regex.split(splitChar);
            let result = '';
            for (let item of dateSeparate) {
                let val = '';
                switch (item) {
                    case 'd':
                        val = o.getDate();
                        break;
                    case 'dd':
                        val = this.date2Char(o.getDate());
                        break;
                    case 'M':
                        val = o.getMonth() + 1;
                        break;
                    case 'MM':
                        val = this.date2Char(o.getMonth() + 1);
                        break;
                    case 'yyyy':
                        val = o.getFullYear();
                        break;
                    case 'yy':
                        val = this.date2Char(o.getFullYear());
                        break;
                    default:
                        break;
                }
                result += val + splitChar;
            }
            return result.substring(0, result.length - 1);
        } else {
            return o.toString();
        }
    } catch(ex) { return ''; }
}

function concatDateToString(args) {
    if (!args.length) return '';
    let result = '';
    for (let i = 1; i < args.length; i++) {
        result += args[i] + args[0];
    }
    return result.substring(0, result.length - 1);
}

function date2Char(d){
    return this.rightString('0' + d);
}

function rightString(o) {
    return o.substr(o.length - 2);
}

使用:

var a = new Date();
console.log('dd/MM/yyyy: ' + toString(a, 'dd/MM/yyyy'));
console.log('MM/dd/yyyy: ' + toString(a, 'MM/dd/yyyy'));
console.log('dd/MM/yy: ' + toString(a, 'dd/MM/yy'));
console.log('MM/dd/yy: ' + toString(a, 'MM/dd/yy'));

要获得本地日期，YYYYMMDD格式，我使用:

var todayDate = (new Date()).toLocaleString('en-GB').slice(0,10).split("\/").reverse().join("");

new Date('Jun 5 2016').
  toLocaleString('en-us', {year: 'numeric', month: '2-digit', day: '2-digit'}).
  replace(/(\d+)\/(\d+)\/(\d+)/, '$3-$1-$2');

// => '2016-06-05'

yyyymmdd=x=>（f=x=>（x<10&&'0'）+x，x.getFullYear（）+f（x.getMonth（）+1）+f（x.getDate（）））; 警报（年年月日（新日期））;

// utc / gmt 0 文档。write('UTC/GMT 0: ' + (new Date()). toisostring()。片(0,19)。替换(/ [^ 0 - 9]/ g, " "));/ / 20150812013509 //客户端本地时间 文档。write('<br/>本地时间:' + (new Date(Date.now()-(new Date()). gettimezoneoffset () * 60000)). toisostring()。片(0,19)。替换(/ [^ 0 - 9]/ g, " "));/ / 20150812113509

你可以使用toISOString函数:

var today = new Date();
today.toISOString().substring(0, 10);

它会给你一个“yyyy-mm-dd”格式。