#yyds干货盘点#three.js源码解读-EventDispatcher

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在three.js中，发现了大量使用Object.assign和Object.create方法，并且很多构造函数都有继承EventDispatcher,现针对EventDispatcher方法研究一下
1.源码

function EventDispatcher()// 构造函数
Object.assign(EventDispatcher.prototype,

addEventListener: function (type, listener)

if (this._listeners === undefined)
this._listeners = ;

var listeners = this._listeners;

if (listeners[type] === undefined)

listeners[type] = [];

if (listeners[type].indexOf(listener) === -1)

listeners[type].push(listener);

,

hasEventListener: function (type, listener)

if (this._listeners === undefined)
return false;

var listeners = this._listeners;

return listeners[type] !== undefined & & listeners[type].indexOf(listener) !== -1;

,

removeEventListener: function (type, listener)

if (this._listeners === undefined)
return;

var listeners = this._listeners;
var listenerArray = listeners[type];

if (listenerArray !== undefined)

var index = listenerArray.indexOf(listener);

if (index !== -1)

listenerArray.splice(index, 1);

,

dispatchEvent: function (event)

if (this._listeners === undefined)
return;

var listeners = this._listeners;
var listenerArray = listeners[event.type];

if (listenerArray !== undefined)

event.target = this;

var array = listenerArray.slice(0);

for (var i = 0, l = array.length; i < l; i++)

array[i].call(this, event);

);

function Texture()// 构造函数

Texture.prototype = Object.assign(Object.create(EventDispatcher.prototype),
test: function()
console.log(test)

)