后方法错误nodejs req.body是返回{}

Question

使用cURL或Postman时，一切都按预期进行

  curl -d 'username=Johny Sample&title=My First Post&description=We want some help cleaning up after the hurricane&postID=Johny Sample_1' http://localhost:3000/NewPost 

请求者结果

 {"posterID":"Johny Sample","title":"My First Post","description":"We want some help cleaning up after the hurricane"} 

服务器结果

 req.body == { username: 'Johny Sample', title: 'My First Post', description: 'We want some help cleaning up after the hurricane', postID: 'Johny Sample_1' } 

无法通过浏览器工作

**

 function gatherData() { var retData ='title='+el("title").value+''; retData +='&description='+el('description').value+''; postID = 'Johny Sample_1'; return retData; } function save() { var xhttp = new XMLHttpRequest(); xhttp.onreadystatechange = function() { if (xhttp.readyState == 4 && xhttp.status == 200) { a = xhttp.responseText; } }; xhttp.open("POST", "http://localhost:3000/NewPost", true); var sendData = gatherData(); xhttp.send(sendData); } 

**

请求者结果

空值

服务器结果

{} {}

服务器端代码

  app.post('/NewPost', function (req, res) { console.log(req.body); var post = {}; post.posterID = req.body.username; post.title = req.body.title; post.description= req.body.description; post.ID = req.body.ID; console.log(post); res.send(post); }) 

Answer 1

您需要为POST添加HTTP标头

xhttp.open("POST", "http://localhost:3000/NewPost", true);
xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
var sendData = gatherData();
xhttp.send(sendData);