handle statuscode and delete file when loading failed #56
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1.处理下载资源的statuscode
2.在readText里面,即使成功读取到文件,并不能保证文件内容正确,所以同样注册事件。在加载失败时删除该文件。
在nextPipe函数里,除了json的其他资源已经注册了回调事件,在加载失败时会自动删除对应文件,所以不需要再修改。