PlayCanvas初学问题汇总

pc.Application类型错误

// Expose prototype methods and create a default tween manager on the application
(function () {
    // Add pc.Application#addTweenManager method
    pc.Application.prototype.addTweenManager = function () {
        this._tweenManager = new pc.TweenManager(this);

        this.on("update", function (dt) {
            this._tweenManager.update(dt);
        });
    };

    // Add pc.Application#tween method
    pc.Application.prototype.tween = function (target) {
        return new pc.Tween(target, this._tweenManager);
    };

    // Add pc.Entity#tween method
    pc.Entity.prototype.tween = function (target, options) {
        var tween = this._app.tween(target);
        tween.entity = this;

        this.once('destroy', tween.stop, tween);

        if (options && options.element) {
            // specifiy a element property to be updated
            tween.element = options.element;
        }
        return tween;
    };

    // Create a default tween manager on the application
    var application = pc.Application.getApplication();
    if (application) {
        application.addTweenManager();
    }

})();

测试

    var application = pc.Application.getApplication();
    console.log(application instanceof pc.AppBase)
    console.log(application instanceof pc.Application)

输出
true
false

调整代码如下：

// Expose prototype methods and create a default tween manager on the application
(function () {
    // Add pc.Application#addTweenManager method
    pc.AppBase.prototype.addTweenManager = function () {
        this._tweenManager = new pc.TweenManager(this);

        this.on("update", function (dt) {
            this._tweenManager.update(dt);
        });
    };

    // Add pc.Application#tween method
    pc.AppBase.prototype.tween = function (target) {
        return new pc.Tween(target, this._tweenManager);
    };

    // Add pc.Entity#tween method
    pc.Entity.prototype.tween = function (target, options) {
        var tween = this._app.tween(target);
        tween.entity = this;

        this.once('destroy', tween.stop, tween);

        if (options && options.element) {
            // specifiy a element property to be updated
            tween.element = options.element;
        }
        return tween;
    };

    // Create a default tween manager on the application
    var application = pc.Application.getApplication();
    if (application) {
        application.addTweenManager();
    }

})();