emsdk_env not working in powershell

I am using this in Windows10, I followed the steps like http://webassembly.org/getting-started/developers-guide/, everything went on well until set emsdk_env.

The emsdk_env works well in cmd but not in powershell. When I am using powsershell to run emsdk_env, no error occurred but the environment vars just do not work properly, for example
`env | grep path`
does not contain directories added by script.

I am not sure whether emsdk_env support powershell or not, could you please help take a look?