What does it mean to enlarge the parentheses directly after the js function call?

I have been watching WeChat Mini Programs recently. About the usage of definitionFilter function, I don"t understand
for example

. 
// behavior.js
module.exports = Behavior({
  definitionFilter(defFields) {
    defFields.data.from = "behavior"
  },
})

// component.js
Component({
  data: {
    from: "component"
  },
  behaviors: [require("behavior.js")],
  ready() {
    console.log(this.data.from) //  behavior  component
  }
})

in the code above, what does it mean to add {} after the definitionFilter function is called, and why?
A little depressed

Javascript WeChat-Mini-Programs
Jun.26,2021

this is not a function call, but a new way for es6 to declare and assign object properties. When the property is a function, you can declare

which is not a function call. Let me split it for you 

module.exports = Behavior({
  definitionFilter(defFields) {
    defFields.data.from = 'behavior'
  },
})

obj = {
  definitionFilter(defFields) {
    defFields.data.from = 'behavior'
  },
}
module.exports = Behavior(obj)


{
  definitionFilter(defFields) {
    defFields.data.from = 'behavior'
  },
}

{
  definitionFilter: function definitionFilter(defFields) {
    defFields.data.from = 'behavior'
  },
}

then overwrite because which is an overlay method.

clipboard.png

clipboard.png

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