WebAssembly环境搭建

Environment：Ubuntu 16.06 + emscripten

URL: https://emscripten.org/docs/getting_started/downloads.html#linux

1. Installation emsdk

# Get the emsdk repo
git clone https://github.com/emscripten-core/emsdk.git

# Enter that directory
cd emsdk

# Fetch the latest version of the emsdk (not needed the first time you clone)
git pull

# Download and install the latest SDK tools.
./emsdk install latest

# Make the "latest" SDK "active" for the current user. (writes .emscripten file)
./emsdk activate latest

# Activate PATH and other environment variables in the current terminal
source ./emsdk_env.sh      

./emsdk install 1.38.45      

# Fetch the latest registry of available tools.
./emsdk update

# Download and install the latest SDK tools.
./emsdk install latest

# Set up the compiler configuration to point to the "latest" SDK.
./emsdk activate latest

# Activate PATH and other environment variables in the current terminal
source ./emsdk_env.sh