如何發送一個對象到http.post請求？

Question

我contact包含object.I要發送到http.post method.Below是我的代碼，我應該在哪裏把contact對象作爲parameter.Please給出鏈接，如果任何也涉及到http.post API。 代碼：

createContacts(contact) { 
    console.log('the contact inside subscribe function',contact); 
    let headers = new Headers(); 
    headers.append('Content-Type', 'application/json'); 
    this.http.post('http://localhost:8080/contacts',{headers : headers}).subscribe(res => { 
     console.log('inside postmehtod of sub.function', res.json());//only objects 

    }); 

    } 

package.json

{ 
    "name": "contactlist", 
    "version": "0.1.0", 
    "description": "A sample Node.js app using Express 4", 
    "engines": { 
    "node": "5.9.1" 
    }, 
    "main": "server.js", 
    "scripts": { 
    "start": "node server.js" 
    }, 
    "devDependencies": { 
    "mongoose": "^4.6.2", 
    "body-parser": "^1.15.2", 
    "cors": "^2.8.0", 
    "del": "2.2.0", 
    "express": "^4.14.0", 
    "http": "0.0.0", 
    "method-override": "^2.3.6", 
    "morgan": "^1.7.0", 
    "superlogin": "^0.6.1" 
    } 
} 

Answer 1

Link to http post api的要求

打字稿交API：post(url: string, body: any, options?: RequestOptionsArgs) : Observable<Response>

實施例：

createContacts(contact) { 
    let headers = new Headers(); 
    headers.append('Content-Type', 'application/json'); 
    this.http.post('http://localhost:8080/contacts', contact, {headers : headers}) 
     .subscribe(res => { 
     console.log('inside postmehtod of sub.function', res.json());//only objects 
     }) 
    }