function countdown(that) { var second = that.data.second if (second == 0) {  // console.log("Time Out...");  that.setData({   second: "Time Out..."  });  return ; } var time = setTimeout(function(){  that.setData({   second: second - 1  });  countdown(that); } ,1000)}Page({  data: {    second: 3  },  onLoad: function() {    countdown(this);  }});

/* 秒級倒計時 */function countdown(that) { var second = that.data.second if (second == 0) {  that.setData({   second: "Time out!",   micro_second: "micro_second too."  });  clearTimeout(micro_timer);  return ; } var timer = setTimeout(function(){  that.setData({   second: second - 1  });  countdown(that); } ,1000)}/* 毫秒級倒計時 */// 初始毫秒數，同時用作歸零var micro_second_init = 100;// 當前毫秒數var micro_second_current = micro_second_init;// 毫秒計時器var micro_timer;function countdown4micro(that) { if (micro_second_current <= 0) {  micro_second_current = micro_second_init; } micro_timer = setTimeout(function(){  that.setData({   micro_second: micro_second_current - 1  });  micro_second_current--;  countdown4micro(that); } ,10)}Page({  data: {    second: 2,    micro_second: micro_second_init  },  onLoad: function() {    countdown(this);    countdown4micro(this);  }});

<text style="display: block;">second: {{second}}s</text><text>{{micro_second}}</text>

function dateformat(second) {  var dateStr = "";  var hr = Math.floor(second / 3600);  var min = Math.floor((second - hr * 3600) / 60);  var sec = (second - hr * 3600 - min * 60);// equal to => var sec = second % 60;  dateStr = hr + ":" + min + ":" + sec;  return dateStr;}目前有2個時鐘，影響性能，合并下去掉countdown，于是countdown4micro變成以下的樣子：function countdown4micro(that) {  var loop_second = Math.floor(loop_index / 100);  // 得知經歷了1s  if (cost_micro_second != loop_second) {    // 賦予新值    cost_micro_second = loop_second;    // 總秒數減1    total_second--;  }   // 每隔一秒，顯示值減1; 渲染倒計時時鐘  that.setData({   clock:dateformat(total_second - 1)  });   if (total_second == 0) {    that.setData({     // micro_second: "",     clock:"時間到"    });    clearTimeout(micro_timer);    return ;   }   if (micro_second_current <= 0) {  micro_second_current = micro_second_init; } micro_timer = setTimeout(function(){  that.setData({   micro_second: micro_second_current - 1  });  micro_second_current--;  // 放在最后++，不然時鐘停止時還有10毫秒剩余  loop_index ++;  countdown4micro(that); } ,10)}

/**  * 需要一個目標日期，初始化時，先得出到當前時間還有剩余多少秒 * 1.將秒數換成格式化輸出為XX天XX小時XX分鐘XX秒 XX * 2.提供一個時鐘，每10ms運行一次，渲染時鐘，再總ms數自減10 * 3.剩余的秒次為零時，return，給出tips提示說，已經截止 */// 定義一個總毫秒數，以一分鐘為例。TODO，傳入一個時間點，轉換成總毫秒數var total_micro_second = 2 * 1000;/* 毫秒級倒計時 */function countdown(that) {   // 渲染倒計時時鐘   that.setData({     clock:dateformat(total_micro_second)   });   if (total_micro_second <= 0) {     that.setData({       clock:"已經截止"     });     // timeout則跳出遞歸     return ;   }     setTimeout(function(){    // 放在最后--    total_micro_second -= 10;    countdown(that);  }  ,10)}// 時間格式化輸出，如3:25:19 86。每10ms都會調用一次function dateformat(micro_second) {   // 秒數   var second = Math.floor(micro_second / 1000);   // 小時位   var hr = Math.floor(second / 3600);   // 分鐘位   var min = Math.floor((second - hr * 3600) / 60);   // 秒位  var sec = (second - hr * 3600 - min * 60);// equal to => var sec = second % 60;  // 毫秒位，保留2位  var micro_sec = Math.floor((micro_second % 1000) / 10);  return hr + ":" + min + ":" + sec + " " + micro_sec;}Page({  data: {    clock: ''  },  onLoad: function() {    countdown(this);  }});