EventTarget()

EventTarget() 构造方法将会创建一个新的EventTarget 对象实例。

语法

var myEventTarget = new EventTarget();

参数

无。

返回值

一个 EventTarget 实例。

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

Specifications

浏览器兼容性

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另见

• EventTarget