前端封装FormData对象post给后端nodejs,nodejs使用formidable解析请求,到这一步为止没有出现任何问题,nodejs能成功解析请求并打印出自己期望的数据。但是我想把解析请求后得到的数据通过superagent post给python服务器,所以用的promise分隔这两段事务,但是却失败了。浏览器提示跨域...
Error: Request has been terminated Possible causes: the network is offline, Origin is not allowed by Access-Control-Allow-Origin, the page is being unloaded, etc. ...Possible causes: the network is offline, Origin is not allowed by Access-Control...
我把post请求部分改为简单的setTimeout这种异步任务,也出现了同样的错误。总之就是我用formidable解析请求后拿到的数据无法再进行下一步的异步任务,一执行就会提示跨域。
单独使用formidable解析请求不进行后续的异步请求不会有问题,使用假数据单独执行后续的异步请求不使用formidable解析请求得到数据也不会有问题。但组合在一起就报错了...
这个bug困扰我三天了,实在解决不了,所以特来此求各路大神帮忙了,感激不尽。
这是我的nodejs接口的代码:
router.post("/api/publish_activity", function( req, res, next ){ //后续的异步任务 function async_task( result ){ return new Promise( ( resolve, reject ) => { console.log( result ) fetch_data_post( back_end_router.publish_activity, result ) } ) } //formidable解析请求 formidablePromise( req ) .then( ( result ) => { return async_task( result ) } ) .then( ( async_task_result ) => { res.json( { error : async_task_result.body.error, message : async_task_result.body.message } ) } ) .catch(( error ) => console.log( error )) }) ``
这是formidablePromise,用于解析请求并返回解析后的数据:
function formidablePromise( req ){ return new Promise(( resolve, reject ) => { // 图片文件将要上传到哪个文件夹下面 var uploadfoldername = "uploadfiles"; var uploadfolderpath = path.resolve( __dirname, "../asset/", uploadfoldername ); // 参数设置 var form = new formidable.IncomingForm({ encoding : "utf-8", uploadDir : uploadfolderpath, keepExtensions : true }) // 保存字段 var fieldList = { } // 保存图片url var fileList = [ ]; // 解析请求 form.parse( req ) .on( "error", function( err ) { return reject( err ) } ) .on( "field", function( name, value ) { fieldList[ name ] = value } ) .on( "file", function( name, file ) { var filename = ( new Date( ) ).getTime( ); switch ( file.type ){ case "image/jpeg" : filename = filename + ".jpg" break case "image/png" : filename = filename + ".png" break default : filename = filename + ".png" break } var file_save_path = uploadfolderpath + "/" + filename; console.log( file.path ); fs.rename( file.path, file_save_path, function(err) { if ( err ) { console.log( err ) } } ); var filepath = "http://" + server + ":" + port + "/" + uploadfoldername + "/" + filename; fileList.push( filepath ); } ) .on( "end", function( ){ var result = { fieldList : fieldList, fileList : fileList }; resolve( result ); } ) }) }
fetch_data_post是使用promise封装superagent的post请求的方法:
fetch_data_post : function( url, post_data, content_type ){ var content_type = typeof( content_type ) != "undefined" ? content_type : { "Content-Type" : "application/x-www-form-urlencoded" } return new Promise(( resolve, reject ) => { request .post( url ) .set( content_type ) .send( post_data ) .end(( error, result ) => { error ? reject( error ) : resolve( result ); }) }) }
请问如果上传两个文件,保存路径不同要怎么写?用formidable