Usage examples of get and set of classes in ES6 javascript

This article mainly introduces the usage of get and set of class classes in ES6 javascript, and analyzes the usage of get and set keywords of classes in ES6 based on specific examples. Friends who need it can refer to it. I hope it can help everyone.

Same as ES5, you can use the get and set keywords inside Class to set the storage function and the value function for a certain attribute to intercept the access behavior of the attribute.

class MyClass {
  constructor() {
    // ...
  }
  get prop() {
    return 'getter';
  }
  set prop(value) {
    console.log('setter: ' + value);
  }
}
let inst = new MyClass();
inst.prop = 123;
// setter: 123
inst.prop
// 'getter'

In the above code, the prop attribute has a corresponding storage function and a value function, so the assignment and reading behaviors are customized.

The storage function and the value function are set on the descriptor object of the attribute.

class CustomHTMLElement {
  constructor(element) {
    this.element = element;
  }
  get html() {
    return this.element.innerHTML;
  }
  set html(value) {
    this.element.innerHTML = value;
  }
}
var descriptor = Object.getOwnPropertyDescriptor(
  CustomHTMLElement.prototype, "html");
"get" in descriptor // true
  "set" in descriptor // true

In the above code, the storage function and the value function are defined on the description object of the html attribute, which is completely consistent with ES5.

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