Question

我有这个JSON数组，我想要的是单独获取密码字段

var user = [ { _id: 5902086ecbc0dd11e4870fd9,
    password: '$2a$08$FIpkmFT1WDZggQYyBA4CVuop6pelbKBfUEJ1/KAVIV2Si9Ho1EYhi',
    email: 'jv100@gmail.com',
    lastName: 'v',
    firstName: 'j',
    updatedDate: 2017-04-27T15:04:14.483Z,
    createdDate: 2017-04-27T15:04:14.483Z } ]

我尝试使用此代码解析它

var obj = JSON.parse(user);
console.log(user.password);

但仍未定义。

Answer 1

用户已经是JSON，因此您无需解析它。但是，它是一个数组。因此，如果您认为它是一个数组，那么您需要使用以下代码来访问密码：

public void sendOrder(String orderSide, int parentOrderId) {
    System.out.println("sendOrder is called");
    Order order = new Order();
    parentOrderId = nextOrderID + 1;
    order.orderId(nextOrderID + 1);
    //order.m_action = "BUY";
    order.action(orderSide);
    //order.m_totalQuantity = 1;
    order.totalQuantity(20000);
    //order.m_lmtPrice = 0.01;
    System.out.println("sendOrder, this.high = " + this.high);

    DecimalFormat df = new DecimalFormat("0.00000"); // TODO get digit according
    String formatedEntryPrice = df.format(this.high);

    System.out.println("formatedEntryPrice = " + formatedEntryPrice);

    order.lmtPrice(Double.valueOf("1.00")); // TODO stop limit at prior day high
    //order.auxPrice(this.high);
    //order.auxPrice(Double.valueOf(formatedEntryPrice));

    //order.m_orderType = "LMT";
    order.orderType("LMT");
    //order.m_account = "U1836253";
    order.account("U1836253");
  order.transmit(false);
    System.out.println("after creating order");


     if (orderSide  == "BUY"){
         Order stopLoss = new Order();
          order.action ("SELL");
        stopLoss.orderId(nextOrderID + 1);
        order.orderType ("TRAIL");
        order.totalQuantity (20000);
        order.trailingPercent (1);
        order.trailStopPrice(low);
        stopLoss.parentId(nextOrderID) ;
         order.transmit(true);
     }


     if (orderSide  == "SELL"){
         Order stopLoss = new Order();
          order.action ("BUY");
        stopLoss.orderId(nextOrderID + 1);
        order.orderType ("TRAIL");
        order.totalQuantity (20000);
        order.trailingPercent (1);
        order.trailStopPrice(low);
        stopLoss.parentId(nextOrderID) ;
         order.transmit(true);
     }





    m_s.placeOrder(nextOrderID + 1, contract, order);

    System.out.println("sendOrder is finished");
    nextOrderID = nextOrderID +1;
    client.reqIds(Integer.valueOf("1"));

    System.out.println("sendOrder is finished 2");
}

Answer 2

它已经是一个无需解析的数组。您可以通过以下方式访问您的酒店：

console.log(user[0].password);

您无法使用user.password访问您的媒体资源，因为user变量不是对象，它是一个数组，您的对象存储在数组的零索引处。

Answer 3

您已经拥有JSON object。因此，无需再次解析它。

<强>样本

＆＃13;

var user = [{ _id: "5902086ecbc0dd11e4870fd9",
    password: '$2a$08$FIpkmFT1WDZggQYyBA4CVuop6pelbKBfUEJ1/KAVIV2Si9Ho1EYhi',
    email: 'jv100@gmail.com',
    lastName: 'v',
    firstName: 'j',
    updatedDate: "2017-04-27T15:04:14.483Z",
    createdDate: "2017-04-27T15:04:14.483Z" } ];
    
var password = user[0].password;

console.log(password);

＆＃13;

Answer 4

变量＆＃39;用户＆＃39;不是JSON数组。它是一个以单个Javascript对象为元素的数组。 JSON.parse（arg）只能用于将JSON字符串解析为普通的Javascript对象。话虽这么说，要访问数组中的javascript对象，你可以这样做：

var userData = user[0];

要访问变量userData中的密码，您可以执行以下操作：

var password = userData.password;

使用以下命令将密码记录到控制台：

console.log(password);

Answer 5

试试这个：

var user = [ {_id:'5902086ecbc0dd11e4870fd9',password: '$2a$08$FIpkmFT1WDZggQYyBA4CVuop6pelbKBfUEJ1/KAVIV2Si9Ho1EYhi',email: 'jv100@gmail.com',lastName: 'v',firstName: 'j',updatedDate: '2017-04-27T15:04:14.483Z',createdDate:' 2017-04-27T15:04:14.483Z' } ];

var obj = user[0];
console.log(obj.password);

如何在节点js中解析JSON

5 个答案: