javascript - 将相同的上下文绑定(bind)到多个函数

Question

我在类中编写了一系列 Promise:

class Executor {

    someFunction(){
        return Promise.resolve(function(){
            console.log(this.name);
        });
    };

    someOtherFunction(){
        return Promise.resolve(function(){
            console.log(this.date);
        });
    };

    execute(){
        let {someFunction, someOtherFunction} = this;
        this.name = "John";
        this.date = "Saturday";
        someFunction=someFunction.bind(this)
        someFunction().then(someOtherFunction.bind(this));
    }

}

然后我通过实例化该类并运行 execute 方法来调用它:

var e = new Executor;
e.execute();

是否有更好的方法将类的上下文绑定(bind)到多个函数，而不是编写多个 bind() 语句？

Answer 1

你真的不需要在这里破坏，这只会让事情变得复杂，KISS :

'use strict';
class Executor {
  someFunction() {
    return new Promise((resolve, reject) =>  {
      setTimeout(() => {
        console.log(this.name);
        resolve();
      }, 250);
    });
  };

  someOtherFunction() {
    return new Promise((resolve, reject) =>  {
      setTimeout(() => {
        console.log(this.date);
        resolve();
      }, 250);
    });
  };

  execute() {
    this.name = "John";
    this.date = "Saturday";
    this.someFunction()
      .then(() => this.someOtherFunction())
      .then(() => { console.log('done!'); });
  }
}

let e = new Executor();
e.execute();

请注意，您的 Promise 用法已被破坏。