Namespace declaration statement has to be the very first statement in the script-去除bom头
今天准备测试小程序的签名加密，但是刚引入官方的“加密数据解密算法”文件到项目里，然后为每个文件添加命名空间的时候，不管怎么加都报“Namespace declaration statement has to be the very first statement in the script”
苦恼了10分钟才发现原来是bom头导致的。
BOM头是放在UTF-8编码的文件的头部的，占用三个字节（0xEF 0xBB 0xBF，即BOM），用来标识该文件属于UTF-8编码。现在已经有很多软件识别BOM头，但是还有些不能识别BOM头，比如PHP就不能识别BOM头，这也是用记事本编辑UTF-8编码后执行就会出错的原因了。
把文件编码改成不带bom头就可以了
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