浅谈node实现图片上传的方法

const http=require('http');

const formidable=require('formidable');

var server=http.createServer(function(req,res){

    // 后端设置跨域

    res.setHeader('Access-Control-Allow-Origin','*');

    res.setHeader('Access-Control-Allow-Headers','Content-Type');

    res.setHeader('Content-Type','application/json');

    switch(req.method){

        case 'OPTIONS':

            res.statusCode=200;

            res.end();

            break;

        case 'POST':

            upload(req,res);

            break;

    }

})

function upload(req,res){

    if(!isFormData(req)){

        res.statusCode=400;

        res.end('请求错误,请使用multipart/form-data格式');

        return;

    }

    var form=new formidable.IncomingForm();

    // 设置上传图片保存文件

    form.uploadDir='./myImage';

    form.keepExtensions=true;

    form.on('field',(field,value)=>{

        console.log(field);

        console.log(value);

    })

    form.on('end',()=>{

        res.end('上传完成!');

    })

    form.parse(req);

}

function isFormData(req){

    let type=req.headers['content-type'] || '';

    return type.includes('multipart/form-data');

}

server.listen(8081,function(){

    console.log('port is on 8081');

})

form.on('progress',(bytesReceived,bytesExpected)=>{

    var precent=Math.floor(bytesReceived/bytesExpected*100);

    console.log(precent);

})

var form = new formidable.IncomingForm()；

form.encoding='utf-8';

form.uploadDir='/tmp/';

form.keepExtensions=false

form.parse(req,function(err,fields,files){

    //...

});