javascript - How does the WeChat applet monitor and execute a function when certain data are all true?

Question

For example, these values ​​​​will change, and the function inside needs to be triggered when these values ​​​​are true. So where is this code written? Can these values ​​be monitored in real time? I previously found that the function inside was not executed because I wrote this code in onload. Now it seems that it is not working. Does anyone have any good ideas?

Answer 1

You can monitor the corresponding events through the getter and setter of JS Object

var obj = {

  val: 100,
  get getval() {
      console.log('访问了getVal的值');
    return this.val;
  },
  set setval(x) {
      console.log('设置getVal的值');
    this.val = x;
  }
}

// 在访问 obj.getval时，将会看到 ‘访问了getVal的值’
// 在设置 obj.setval=1000时，会看到 ‘设置getVal的值’

Answer 2

Reference: /q/10...