xml 浏览器打开报错Input is not proper UTF-8, indicate encoding !

xml 中如果包含部分 ascii 控制字符（小数字）则 chrome会报告如下类型错我：

This page contains the following errors:
error on line 20 at column 89: Input is not proper UTF-8,indicate encoding !
Bytes: 0x08 0xE8 0xBA 0xB2
Below is a rendering of the page up to the first error.

解决办法：replace 这些字符

xxx.replace(/\u0000|\u0001|\u0002|\u0003|\u0004|\u0005|\u0006|\u0007|\u0008|\u0009|\u000a|\u000b|\u000c|\u000d|\u000e|\u000f|\u0010|\u0011|\u0012|\u0013|\u0014|\u0015|\u0016|\u0017|\u0018|\u0019|\u001a|\u001b|\u001c|\u001d|\u001e|\u001f/g,"")

原因：XML 规范不支持如下字符

#x0 - #x8 (ASCII 0 - 8)
#xB - #xC (ASCII 11 - 12)
#xE - #x1F (ASCII 14 - 31)

参看文档：https://support.microsoft.com/en-us/kb/315580