Method setEntityAttribute

src/core/a-entity.js:543–553

* Deals with updates on entity-specific attributes (i.e., components and mixins). * * @param {string} attr * @param {string} oldVal * @param {string|object} newVal

(attr, oldVal, newVal)

   * @param {string|object} newVal
   */
  setEntityAttribute (attr, oldVal, newVal) {
    if (COMPONENTS[attr] || this.components[attr]) {
      this.updateComponent(attr, newVal);
      return;
    }
    if (attr === 'mixin') {
      // Ignore if `<a-node>` code is just updating computed mixin in the DOM.
      if (newVal === this.computedMixinStr) { return; }
      this.mixinUpdate(newVal, oldVal);
    }
  }

  /**
   * When mixins updated, trigger init or optimized-update of relevant components.