Object.operator bool 布尔运算

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
	public void Awake() {
	if (typeof(rigidbody))
		Debug.Log("Rigidbody attached to this transform");

	}
}

// check if there is a rigidbody attached to this transform
//检查物体是否添加了刚体？
if (rigidbody)
	Debug.Log("Rigidbody attached to this transform");

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
	public void Awake() {
	if (rigidbody != null)
		Debug.Log("Rigidbody attached to this transform");

	}
}

// another way to check if a rigidbody is attached to this transform
//另一种方检查物体是否添加了刚体？
if (rigidbody != null)
	Debug.Log("Rigidbody attached to this transform");