Question

我正在尝试在Nodejs中执行GET方法。在执行GET之后，我想使用MAP函数并将所有名称收集为数组。

但是我收到以下错误，

/root/server.js:21                                                                                                                                                                                       
    var op = body.products.map(function(item) {                                                                                                                                                          
                          ^                                                                                                                                                                              

TypeError: Cannot read property 'map' of undefined                                                                                                                                                       
    at IncomingMessage.<anonymous> (/root/server.js:21:27)                                                                                                                                               
    at emitNone (events.js:85:20)                                                                                                                                                                        
    at IncomingMessage.emit (events.js:179:7)                                                                                                                                                            
    at endReadableNT (_stream_readable.js:913:12)                                                                                                                                                        
    at _combinedTickCallback (internal/process/next_tick.js:74:11)                                                                                                                                       
    at process._tickCallback (internal/process/next_tick.js:98:9)

CODE是，

var http = require('http');
    console.log("hi")
    var options = {
      host: 'api.usergrid.com',
      path: '/siddharth1/sandbox/restaurants'
    };

    var req = http.get(options, function(res) {
      console.log('STATUS: ' + res.statusCode);
      console.log('HEADERS: ' + JSON.stringify(res.headers));

      // Buffer the body entirely for processing as a whole.
      var bodyChunks = [];
      res.on('data', function(chunk) {
        // You can process streamed parts here...
        bodyChunks.push(chunk);
      }).on('end', function() {
        var body = Buffer.concat(bodyChunks);
        console.log('BODY: ' + body);
        // ...and/or process the entire body here.
        var op = input.entities.map(function(item) {
           return item.name;
         });
          console.log(op);
      })
    });

    req.on('error', function(e) {
      console.log('ERROR: ' + e.message);
    });

    console.log('Server listening on port 80');

我不知道我哪里出错了，因为在控制台我可以看到身体有json数据。

Kidnly帮帮我。

Answer 1

谢谢@Felix Kling 如你所说，我补充说，
var body2 = JSON.parse（body）;我得到了阵列。

  var body2 = JSON.parse(body);
    // ...and/or process the entire body here.
    var op = body2.entities.map(function(item) {
        return item.name;
      });
      console.log(op);

如果我有任何其他疑问，我会回来。

无法读取undefined的地图

1 个答案: