时间和星期几

function showTopTime(){
    var d1 = new Date();
    var m = d1.getMonth() + 1;
    var d = d1.getDate();
    var w = d1.getDay();//0是星期天 1是星期一……
    var h = d1.getHours();
    var i = d1.getMinutes();

    if(m < 10)m = '0' + m;
    if(d < 10)d = '0' + d;
    if(h < 10)h = '0' + h;
    if(i < 10)i = '0' + i;
    var html = '<table border="1" cellpadding="0" cellspacing="0">';
    html += '<tr>';
    html += '<td rowspan="2" class="topTimeHi">' +  h + ':' + i  + '</td>';
    html += '<td class="topTimeMd">' + m + '.' + d + '</td>';
    html += '</tr>';
    html += '<tr>';
    html += '<td class="topTimeMd">星期' + '天一二三四五六'.charAt(w) + '</td>';
    html += '</tr>';
    html += '</table>';
    document.querySelector('.topTime').innerHTML = html;
}
showTopTime();
window.setInterval(showTopTime,5000);