why my node-supervisor doesn't work

[coderzzp]

i want to setupo a static server
IM running my server in shell like this

$ supervisor  server.js

Running node-supervisor with
  program 'server.js'
  --watch '.'
  --extensions 'node,js'
  --exec 'node'

Starting child process with 'node server.js'
Watching directory 'E:\frontDev\three' for changes.

but when i change the file in 'E:\frontDev\three\index.html'，the shell doesn't upadate .only when i changed 'E:\frontDev\three\server.js' ,the shell show like this

crashing child
Starting child process with 'node server.js'

thanks for you reply