此代码的环回有什么问题？

Question

我想测试一个示例模型create但它显示Cannot GET /explorer/与浏览localhost:3001/explorer：

var loopback = require('loopback'); 
var app = module.exports = loopback(); 

var Item = loopback.createModel(
    'Item', 
    { 
    description: 'string', 
    completed: 'boolean' 
    } 
); 

app.model(Item); 
app.use('/api', loopback.rest()); 

app.start = function() { 
    // start the web server 
    return app.listen(function() { 
    app.emit('started'); 
    var baseUrl = app.get('url').replace(/\/$/, ''); 
    console.log('Web server listening at: %s', baseUrl); 
    if (app.get('loopback-component-explorer')) { 
     var explorerPath = app.get('loopback-component-explorer').mountPath; 
     console.log('Browse your REST API at %s%s', baseUrl, explorerPath); 
    } 
    }); 
}; 

app.listen(3001); 

Answer 1

这里说，你应该把它app.listen（8080）之前;所以基本上你的代码结构应该是这样的

var loopback = require('loopback'); 
var app = module.exports = loopback(); 

//you add the items here like 
/* 
POST /Items 
GET /Items 
PUT /Items 
PUT /Items/{id} 
HEAD /Items/{id} 
GET /Items/{id} 
DELETE /Items/{id} 
GET /Items/{id}/exists 
GET /Items/count 
GET /Items/findOne 
POST /Items/update 
*/ 
var Item = loopback.createModel(
'Item', 
{ 
description: 'string', 
completed: 'boolean' 
} 
); 

app.model(Item); 
app.use('/api', loopback.rest()); 

    app.start = function() { 
// start the web server 
return app.listen(function() { 
app.emit('started'); 
var baseUrl = app.get('url').replace(/\/$/, ''); 
console.log('Web server listening at: %s', baseUrl); 
if (app.get('loopback-component-explorer')) { 
var explorerPath = app.get('loopback-component-explorer').mountPath; 
console.log('Browse your REST API at %s%s', baseUrl, explorerPath); 
} 
}); 
}; 
app.listen(8080);