javascript - 修改 Meteor.setInterval 函数中的类属性

Question

我需要做:

TestClass = function(){
   this.left =10
   this.finterval = function(){
       console.log("this.finterval:"+JSON.stringify(intervalId))
       this.left =  this.left -1
       Meteor.clearInterval(intervalId)
   }
   var intervalId = Meteor.setInterval(this.finterval,1000)
   console.log("this.intervalId:" + this.intervalId)
}

有没有办法在interval方法中修改this.left？

Answer 1

this 始终引用当前作用域，因此如果您嵌套函数，则需要将其分配给另一个 var(例如 self):

TestClass = function(){
   this.left =10
   var self = this;
   this.finterval = function(){
       console.log("this.finterval:"+JSON.stringify(intervalId))
       self.left =  self.left -1
       Meteor.clearInterval(intervalId)
   }
   var intervalId = Meteor.setInterval(this.finterval,1000)
   console.log("this.intervalId:" + this.intervalId)
}