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

Previous: The problem of making api list Interface by thinkphp

Next: A stored procedure that calls MySQL reports an error

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
© 2021 CodesHelper
Advertising Contact us About us
Menu