那位大佬帮找找看是年龄出问题了 
版本：3.8.1
代码：
import {_decorator, CCInteger, Component, Node, Prefab, instantiate} from ‘cc’;
import {BLOCK_SIZE, PlayController} from “db://assets/scripts/PlayController”;
const {ccclass, property} = _decorator;
enum BlockType {
BT_NONE,
BT_STONE,
};
@ccclass(‘GameManager’)
export class GameManager extends Component {
@property({type: Prefab})
public boxPrefab: Prefab | null = null;
@property({type: CCInteger})
public roadLength: number = 50;
private _road: BlockType[] = [];
start() {
this.generateRoad()
}
update(deltaTime: number) {
}
generateRoad() {
console.log(this.node, 'node')
this.node.removeAllChildren();
this._road = [];
// startPos
this._road.push(BlockType.BT_STONE);
for (let i = 1; i < this.roadLength; i++) {
if (this._road[i - 1] === BlockType.BT_NONE) {
this._road.push(BlockType.BT_STONE);
} else {
this._road.push(Math.floor(Math.random() * 2));
}
}
for (let j = 0; j < this._road.length; j++) {
let block: Node | null = this.spawnBlockByType(this._road[j]);
if (block) {
block.setPosition(j * BLOCK_SIZE, 0, 0);
this.node.addChild(block);
}
}
}
spawnBlockByType(type: BlockType) {
if (!this.boxPrefab) {
return null;
}
let block: Node|null = null;
switch(type) {
case BlockType.BT_STONE:
block = instantiate(this.boxPrefab);
break;
}
return block;
}
}