a demo integrated u3.js into react native

u3.js is default to browser and nodejs environments, but you can still integrate u3.js to react native using rn-nodeify.

1. for a new react native project, npm install -g react-native-cli first and then react-native init XXX.

2. npm install -g rn-nodeify.

3. update package.json adding "postinstall": "rn-nodeify --install --hack", to the scripts.

4. cd XXX and then npm install u3.js asyncstorage-down --save or if you just need the ecc lib for signing, npm install u3-utils --save

5. replace the generated file shim.js with the same one in the root of project.

6. add import './shim'; to top position of the entry file index.js.

7. refer to App.js and use u3.js in react native.

if you have any problem when integrating u3.js to react native,please contact me.