php -S 0.0.0.0:9999 或 放在nginx、apache等其他web服务器里运行

git clone https://github.com/juj/emsdk.git
cd emsdk
./emsdk install latest
./emsdk activate latest
source ./emsdk_env.sh

wget https://github.com/opencv/opencv/archive/3.4.1.zip
unzip 3.4.1.zip
cd opencv-3.4.1
# 将OpenCV编译为WASM版本
python ./platform/js/build_js.py build_wasm --build_wasm

# 编译后的文件将生成在build_wasm/bin目录内,得到需要的opencv_js.wasm和opencv.js文件