这是错误提示：
Assets/Standard Assets/Editor/CrossPlatformInput/CrossPlatformInputInitialize.cs(91,34): error CS0619: UnityEditor.BuildTargetGroup.WebPlayer' is obsolete:WebPlayer was removed in 5.4, consider using WebGL'
它的意思大概是WebPlayer已经过时了，你将代码91行的WebPlayer改成WebGL就可以了