如果下载期间出错,则返回错误消息(只读)。
如果未出现错误,error
将返回 null
或空字符串(因为某些平台不允许字符串值为 null 值)。我们建议您使用 String.IsNullOrEmpty 检查是否存在错误,以便涵盖这两种情况。
如果对象尚未下载完数据,将一直处于阻塞状态,直到下载完成。
使用 isDone 或 yield
查看数据是否可用。
using UnityEngine; using System.Collections;
public class ExampleClass : MonoBehaviour { // Make a request with an invalid url public string url = "invalid_url"; IEnumerator Start() { using (WWW www = new WWW(url)) { yield return www; if (!string.IsNullOrEmpty(www.error)) Debug.Log(www.error); } } }
示例中的 URL 是无效的,因此错误消息将是“Couldn't resolve host”。
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