Function copyDemo

cli/init.js:133–143

(resolve, reject)

}

function copyDemo (resolve, reject) {
  try {
    mkdir('./demo');
    copy(`${__dirname}/demo/index.js`, './demo/index.js');
    copy(`${__dirname}/demo/index.html`, './demo/index.html');
    console.log('add demo dir success.');
    resolve(true);
  } catch (e) {
    reject(e);
  }
}

function copyDevServer (resolve, reject) {
  try {