有时候，我们需要对cocos的预制体做简单处理，比如获取prefab包围盒大小，或者改改其中几个值，又不想用插件方式去实现，毕竟还是功能简单，插件方式又太麻烦；
那我们就自己解析下prefab，毕竟只是一个json，这里就提供一个node环境下简单的prefab解析工具，只读取了其中几个值，大家可以自行扩展：
class Prefab {
constructor(jsonData) {
this.jsonData = jsonData;
this._elements = [];
this.parseJson();
}
get name() {
return this.jsonData._name;
}
parseJson() {
this.jsonData.forEach((element) => {
let elm = null;
switch(element.__type__) {
case "cc.Node":
elm = new Node(this, element);
break;
case "cc.UITransform":
elm = new UIComponent(this, element);
break;
case "cc.Sprite":
elm = new Sprite(this, element);
break;
default:
elm = new Component(this, element);
break;
}
this._elements.push(elm);
});
this._elements.forEach((element) => {
element.parseJson();
});
}
getElement(id) {
return this._elements[id];
}
getNode(name) {
for(let i = 0; i < this._elements.length; i++) {
let element = this._elements[i];
if(element.name == name && element.type == "cc.Node") {
return element;
}
}
return null;
}
findNode(name) {
let split = name.split("/");
let node = null;
for(let i = 0; i < split.length; i++) {
if(i == 0) {
node = this.getNode(split[i]);
}else{
node = node.getNode(split[i]);
}
if(!node) {
return null;
}
}
return node;
}
}
class Element {
constructor(prefab, jsonData) {
this.prefab = prefab;
this.jsonData = jsonData;
}
get type() {
return this.jsonData.__type__;
}
get name() {
return this.jsonData._name;
}
parseJson() {
}
}
class Node extends Element {
constructor(prefab, jsonData) {
super(prefab, jsonData);
this._children = [];
this._components = [];
this._uiComponent = null;
}
get children() {
return this._children;
}
get components() {
return this._components;
}
get uiComponent() {
return this._uiComponent;
}
get pos() {
return this.jsonData._lpos;
}
get scale() {
return this.jsonData._lscale;
}
getChild(name) {
for(let i = 0; i < this._children.length; i++) {
let child = this._children[i];
if(child.name == name) {
return child;
}
}
return null;
}
findChild(name) {
let split = name.split("/");
let child = null;
for(let i = 0; i < split.length; i++) {
child = child.getChild(split[i]);
if(!child) {
return null;
}
}
return child;
}
getComponent(type) {
for(let i = 0; i < this._components.length; i++) {
let component = this._components[i];
if(component.type == type) {
return component;
}
}
return null;
}
parseJson() {
for(let i = 0; i < this.jsonData._children.length; i++) {
let child = this.jsonData._children[i];
let id = child.__id__;
this._children.push(this.prefab.getElement(id));
}
for(let i = 0; i < this.jsonData._components.length; i++) {
let component = this.jsonData._components[i];
let id = component.__id__;
let comp = this.prefab.getElement(id);
this._components.push(comp);
if(!this._uiComponent && comp.type == "cc.UITransform") {
this._uiComponent = comp;
}
}
}
}
class Component extends Element {
constructor(prefab, jsonData) {
super(prefab, jsonData);
}
parseJson() {
}
}
class UIComponent extends Component{
parseJson() {
}
get anchorPoint() {
return this.jsonData._anchorPoint;
}
get contentSize() {
return this.jsonData._contentSize;
}
}
class Sprite extends Component{
parseJson() {
}
}
module.exports = {
Prefab,
Node,
Component,
UIComponent,
Sprite,
}
是的呀