本文内容：

react-native-fs的简单使用

下载文件(图片、文件、视频、音频)

将文本写入本地 txt

读取txt文件内容

在已有的txt上添加新的文本

删除文件

上传文件 only iOS

安装步骤

第一步：

npm install react-native-fs --save

第二步：

react-native link react-native-fs

OK 即可开始使用(不放心的可以按照github上的对比一下)

简单使用

import RNFS from 'react-native-fs';

下载文件

/*下载文件*/

downloadFile() {

// On Android, use "RNFS.DocumentDirectoryPath" (MainBundlePath is not defined)

// 图片

// const downloadDest = `${RNFS.MainBundlePath}/${((Math.random() * 1000) | 0)}.jpg`;

// const formUrl = 'http://img.kaiyanapp.com/c7b46c492261a7c19fa880802afe93b3.png?imageMogr2/quality/60/format/jpg';

// 文件

// const downloadDest = `${RNFS.MainBundlePath}/${((Math.random() * 1000) | 0)}.zip`;

// const formUrl = 'http://files.cnblogs.com/zhuqil/UIWebViewDemo.zip';

// 视频

// const downloadDest = `${RNFS.MainBundlePath}/${((Math.random() * 1000) | 0)}.mp4`;

// http://gslb.miaopai.com/stream/SnY~bbkqbi2uLEBMXHxGqnNKqyiG9ub8.mp4?vend=miaopai&

// https://gslb.miaopai.com/stream/BNaEYOL-tEwSrAiYBnPDR03dDlFavoWD.mp4?vend=miaopai&

// const formUrl = 'https://gslb.miaopai.com/stream/9Q5ADAp2v5NHtQIeQT7t461VkNPxvC2T.mp4?vend=miaopai&';

// 音频

const downloadDest = `${RNFS.MainBundlePath}/${((Math.random() * 1000) | 0)}.mp3`;

// http://wvoice.spriteapp.cn/voice/2015/0902/55e6fc6e4f7b9.mp3

const formUrl = 'http://wvoice.spriteapp.cn/voice/2015/0818/55d2248309b09.mp3';

const options = {

fromUrl: formUrl,

toFile: downloadDest,

background: true,

begin: (res) => {

console.log('begin', res);

console.log('contentLength:', res.contentLength / 1024 / 1024, 'M');

},

progress: (res) => {

let pro = res.bytesWritten / res.contentLength;

this.setState({

progressNum: pro,

});

}

};

try {

const ret = RNFS.downloadFile(options);

ret.promise.then(res => {

console.log('success', res);

console.log('file://' + downloadDest)

}).catch(err => {

console.log('err', err);

});

}

catch (e) {

console.log(error);

}

}

将文本写入本地 txt

/*将文本写入本地 txt*/

writeFile() {

// create a path you want to write to

const path = RNFS.MainBundlePath + '/test.txt';

// write the file

RNFS.writeFile(path, '这是一段文本，YES', 'utf8')

.then((success) => {

console.log('path', path);

})

.catch((err) => {

console.log(err.message);

});

}

读取txt文件内容

/*读取txt文件内容*/

readFile() {

// create a path you want to delete

const path = RNFS.MainBundlePath + '/test.txt';

return RNFS.readFile(path)

.then((result) => {

console.log(result);

this.setState({

readTxtResult: result,

})

})

.catch((err) => {

console.log(err.message);

});

}

在已有的txt上添加新的文本

/*在已有的txt上添加新的文本*/

appendFile() {

const path = RNFS.MainBundlePath + '/test.txt';

return RNFS.appendFile(path, '新添加的文本', 'utf8')

.then((success) => {

console.log('success');

})

.catch((err) => {

console.log(err.message);

});

}

删除文件

/*删除文件*/

deleteFile() {

// create a path you want to delete

const path = RNFS.MainBundlePath + '/test.txt';

return RNFS.unlink(path)

.then(() => {

console.log('FILE DELETED');

})

// `unlink` will throw an error, if the item to unlink does not exist

.catch((err) => {

console.log(err.message);

});

}

上传文件 only iOS

/*上传文件 only iOS*/

uploadFile() {

const uploadSrc = `${RNFS.MainBundlePath}/test.txt`;

const uploadUrl = 'http://buz.co/rnfs/upload-tester.php';

const options = {

toUrl: uploadUrl,

files: [{name: 'myfile', filename: 'test.txt', filepath: uploadSrc, filetype: 'text/plain'}],

background: true,

method: 'POST', // PUT

begin: (res) => {

console.log('begin', res);

},

progress: (res) => {

console.log('progress', res);

}

};

const ret = RNFS.uploadFiles(options);

return ret.promise.then(res => {

const response = JSON.parse(res.body);

console.log(response);

})

.catch(err => {

console.log('err', err);

});

}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持dt猫。