RN-log日志

var RNFS = require('react-native-fs');

const path = 'file:///sdcard/along/logs';

export function writeLog(data, index) {

  if (!index) {

    index = 0;

  }

  const date = new Date();

  const dateStr = `${date.getFullYear()}-${date.getMonth() + 1}-${date.getDate()}`;

  const filePath = `${path}/h5shell-rn/${dateStr}_${index}.txt`;

  makeDir(path).then(() => {

    return makeDir(path + '/h5shell-rn');

  }).then(() => {

    return RNFS.exists(filePath);

  }).then((fileExists) => {

    const time = `${date.getHours()}:${date.getMinutes()}:${date.getSeconds()}`;

    const input = `${time} ${data}`;

    if (!fileExists) {

      RNFS.writeFile(filePath, input, 'utf8');

    } else {

      RNFS.stat(filePath).then(stats => {

        if (stats.size > 5 * 1024 * 1024) {

          writeLog(data, index++);

        } else {

          RNFS.appendFile(filePath, `\r\n${input}`, 'utf8');

        }

      })

    }

  })

}

export function makeDir(dir) {

  return new Promise((resolve, reject) => {

    RNFS.exists(dir).then(exists => {

      if(!exists) {

        return RNFS.mkdir(dir);

      }

    }).then(()=>{

      resolve();

    }).catch(err => {

      reject(err);

    })

  })

}