kura 是用代码写的，不是用IDE，这个是第一次摧毁，下面是添加的代码，rigidBody跟boxColl,add的顺序不一样，报的错也不一样
rigidBody = new RigidBody();
rigidBody.allowSleep = true;
rigidBody.group = -1;
rigidBody.gravityScale = 0;
rigidBody.allowRotation = false;
rigidBody.type = "static";
addComponentIntance(rigidBody);
boxColl = new BoxCollider();
boxColl.label = "enemy";
boxColl.restitution = 1;
boxColl.friction = 0;
addComponentIntance(boxColl);
