Javascript 类变量重新分配

Question

我正在创建一个 Class 实例，我有点陷入变量重新分配，如下所示

class A {
  constructor() {
    this.checkBoolen = false
  }

  checkBoolen = false // error, asks to install @babel/plugin-proposal-class-properties to get support.

  click() {
   document.addEventListener('click', e => {
      this.checkBoolen=true // <- a class constructor's prototype property can't be reassigned.
   })
  }

  doSomthing() {
   if(this.checkBoolen = true // <- never get there) {
    console.log('do something')
       setTimeout(function(){ this.checkBoolen = false}, 3000)
   }
  }
}

看起来我需要使用@babel/plugin-proposal-class-properties？或者将Class更改为函数？我想知道是否有办法更改 Class 内的变量，或者这是一个不好的做法？

Answer 1

有多个不匹配的括号，class关键字大写

class A {
  constructor() {
    this.checkBoolen = false
  }

   checkBoolen = false // error, asks to install @babel/plugin-proposal-class-properties to get support.

  click() {
   document.addEventListener('click', e => {
      this.checkBoolen=true // <- a class constructor's prototype property can't be reassigned.
   });
  }

  doSomthing() {
   if(this.checkBoolen = true )// <- never get there) {
    console.log('do something')
   }
}

你可以像这样使用它

let obj = new A();
obj.checkBoolen=true
obj.doSomthing()