Detailed tutorial on the use of setinterval timing function of wechat applet

1、setInterval The understanding of the
（1）setInterval understand
setInterval Timing function , Is how long to delay the non-stop call setInterval The function in , I want to know more about setInterval function , Let's take a look first setInterval Function components .
（2）setInterval form
setInterval(function () {}, Time ).function () {} Just keep executing functions , Time is how long it's delayed. Keep executing , a key function () {} function
Concrete example ：

 setInterval(function () {
 				//.toClock1() Is a concrete function , Write outside 
 				_this.toClock1();}, 6000);

（3）setInterval Need to be closed
Use clearInterval（） To close , See the following for specific use

clearInterval（）

2、setInterval Put it in wechat applet onshow In the function
onShow： Triggered when this page is displayed or when you jump back to the applet from the background , Triggered when returning from the jump page , Can't pass parameters
3、setInterval Specific use
（1） Set global variables timer（timer Whatever the ）

// In wechat applet data Write the following code in ,timer Global variables 
 data: {
    timer: null,
  },

（2）onshow Write setInterval function

onShow: function () {
      const _this = this
       // Timer    The function is assigned to timer   convenient clearInterval（） Use 
       _this.data.timer = setInterval(
         function () {
        _this.toClock1();        
        }, 6000);

	    _this.setData({
	      timer:_this.data.timer
	    });
  },

toClock1() function

// Contents of timing function execution    Play by yourself     Write your own code 
toClock1(){
	console.log(this.data.timer)
}

3、 Leave the current page and close setInterval Timing function
Code placed in onhide inside

onHide: function () {
// close clearInterval Timing function 
    clearInterval(this.data.timer);
    this.setData({
      timer: null
    });
    console.log(this.data.timer)
  },

WeChat applet more practical skills, pay attention to the official account below.