用js获取当前时间

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<body>
    <script>
        function time() {
            var date = new Date();
            var year = date.getFullYear();
            var month = date.getMonth() + 1;
            var day = date.getDate();
            day = day <10? '0'+day:day;
            var hour = date.getHours();
            hour = hour <10? '0'+hour:hour;
            var minutes = date.getMinutes();
            minutes = minutes <10? '0'+minutes:minutes;
            var seconds = date.getSeconds();
            seconds = seconds <10? '0'+seconds:seconds;
            var week = date.getDay();
            switch (week) {
                case 0:
                    week = '日';
                    break;
                case 1:
                    week = '一';
                    break;
                case 2:
                    week = '二';
                    break;
                case 3:
                    week = '三';
                    break;
                case 4:
                    week = '四';
                    break;
                case 5:
                    week = '五';
                    break;
                case 6:
                    week = '六';
                    break;
            }
            var time1 = year + '年' + month + '月' + day + '号' + hour + '时' +
            minutes + '分' + seconds + '秒' +'<br>'+ '今天是' + '星期'+week;
            document.write(time1);
        }
        time();