学习ts和creator网站

// Learn TypeScript:

//  - https://docs.cocos.com/creator/manual/en/scripting/typescript.html

（https://docs.cocos.com/creator/2.4/manual/en/scripting/typescript.html）

// Learn Attribute:

//  - https://docs.cocos.com/creator/manual/en/scripting/reference/attributes.html

// Learn life-cycle callbacks:

//  - https://docs.cocos.com/creator/manual/en/scripting/life-cycle-callbacks.html