Various ways of writing timed tasks of small programs

The first way ：

（1） Calling code

 var that = this;
 this.sendCode() 

（2） Timing task code ：

// Timing task （60 Auto end in seconds ）
sendCode: function (e) {
   var times = 0;
   var i = setInterval(function () {
     times++;
     if (times >= 60) {
       wx.showToast({// Message box 
         title: ' End the scheduled task ',
         icon: 'none',
         duration: 2000
       })
       clearInterval(i);// Turn off scheduled tasks 
     } else {
    		// Business logic 
      }
   }, 1000)
}

The second way ：

（1） Calling code ： Use it directly .

（2） Timing task code ：

var that = this;
var times = 0;
that.setData({
    selectCode: setInterval(function () {
      times++;
      if (times >= 60) {
        clearInterval(that.data.selectCode);// Turn off scheduled tasks 
      } else {
      	// Business logic 
      }
	}, 1000) // Timing interval   Here is 1 second 
})

The third way ：

var timer; //  timer 

Page({
  // ... Omit 
  
  //  Custom start button 
  startBtn: function () {
    console.log(" Start button ");
    Countdown();
  },

　　//  Custom pause button   
  pauseBtn: function () { 
    console.log(" Pause button ");
    clearTimeout(timer);
  },
});

//  count down 
function Countdown() {
  timer = setTimeout(function () {
    console.log("----Countdown----");
    Countdown();
  }, 1000);
};