// 输出流var stream = process.stdout; // 输出var write = function (str) {  stream.write(str);}; // 生成ANSI escape sequences代码：http://en.wikipedia.org/wiki/ANSI_escape_codevar CSI = exports.CSI = function (str, c) {  return '\x1b[' + str + c;}; // 生成带颜色的文本var color = exports.color = function (text, c, bgc) {  if (isNaN(bgc)) bgc = 0;  c = Number(c) + 30;  bgc = Number(bgc) + 40;  var ret = CSI(c + ';' + bgc, 'm') + text + CSI('37;40', 'm');  return ret;}; // 设置光标位置，位置从1开始var setCursor = exports.setCursor = function (row, column) {  write(CSI(row + ';' + column, 'H'));}; // 清屏var clear = function (bgcolor) {  setCursor(1, 1);  for (var i = 0; i < stream.rows; i++) {    var line = '';    for (var j = 0; j < stream.columns; j++) {      line += ' ';    }    write(color(line, 0, 6));  }}; // 画矩形var DOUBLE_LINE = '══════════════════════════════════════════════════════════' +                  '══════════════════════════════════════════';var SPACE_LINE = '                                                           ' +                 '                                         ';var drawRect = function (top, left, width, height, bgcolor) {  setCursor(top, left);  var w = width / 2 - 2;  var c = function (str) {    return color(str, 0, 7);  };  write(c('╔') + c(DOUBLE_LINE.substr(0, w)) + c('╗'));  for (var i = 1; i < height - 1; i++) {    setCursor(top + i, left)    write(c('‖') + color(SPACE_LINE.substr(0, w), 0, bgcolor) +          color(SPACE_LINE.substr(0, w), 0, bgcolor) + c('‖'));  }  setCursor(top + height - 1, left);  write(c('╚') + c(DOUBLE_LINE.substr(0, w)) + c('╝'));  setCursor(top + 1, left + 2);};  // -----------------------------------------------------------------------------// --------------- 开始 -------------------------------------------------------- // 开始clear();// 要绘制的窗口宽度和高度var w = 68;var h = 5;var t = (stream.rows - h) / 2;var l = (stream.columns - w) / 2;drawRect(t, l, w, h, 7);var randomColor = function () {  var r = Math.round(Math.random() * 5);  return r + 1;};var updateTime = function () {  setCursor(t + 2, (stream.columns - 48) / 2);  write(color(new Date().toLocaleString() + '   ', randomColor(), 7));};updateTime();setInterval(updateTime, 1000);