EventTarget構(gòu)造函數(shù)

EventTarget構(gòu)造函數(shù)

該EventTarget()構(gòu)造函數(shù)創(chuàng)建一個新的EventTarget對象實(shí)例。

EventTarget()構(gòu)造函數(shù)語法

var myEventTarget = new EventTarget();

參數(shù)

沒有。

返回值

EventTarget對象的一個實(shí)例。

例子

class MyEventTarget extends EventTarget {
  constructor(mySecret) {
    super();
    this._secret = mySecret;
  }

  get secret() { return this._secret; }
};

let myEventTarget = new MyEventTarget(5);
let value = myEventTarget.secret;  // == 5
myEventTarget.addEventListener("foo", function(e) {
  this._secret = e.detail;
});

let event = new CustomEvent("foo", { detail: 7 });
myEventTarget.dispatchEvent(event);
let newValue = myEventTarget.secret; // == 7

規(guī)范

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