如何在javascript

Question

我有以下脚本输出json格式的对象：

function test() {
    autoscaling.describeAutoScalingGroups(params, function(err, data) {
        if (err) console.log(err, err.stack); // an error occurred
        else console.log(JSON.stringify(data)); // successful response
    });
}

test();

这输出以下json：

{
  "ResponseMetadata": {
    "RequestId": "##################"
  },
  "AutoScalingGroups": [
    {
      "AutoScalingGroupName": "################",
      "AutoScalingGroupARN": "arn:aws:autoscaling:eu-west-1:#########:autoScalingGroup:###########",
      "LaunchConfigurationName": "######-LC-###########",
      "MinSize": 0,
      "MaxSize": 0,
      "DesiredCapacity": 0,
      "DefaultCooldown": 300,
      "AvailabilityZones": [
        "eu-west-1b",
        "eu-west-1c",
        "eu-west-1a"
      ],
      "LoadBalancerNames": [
        "#########-ELB-###########"
      ],
      "TargetGroupARNs": [

      ],
      "HealthCheckType": "ELB",
      "HealthCheckGracePeriod": 300,
      "Instances": [

      ],
      "CreatedTime": "2017-11-08T18:22:05.093Z",
      "SuspendedProcesses": [
        {
          "ProcessName": "Terminate",
          "SuspensionReason": "User suspended at 2017-11-08T18:22:14Z"
        }
      ],
      "VPCZoneIdentifier": "subnet-######,subnet-#######,subnet-#######",
      "EnabledMetrics": [

      ],
      "Tags": [
        {
          "ResourceId": "#######-ASG-##########",
          "ResourceType": "auto-scaling-group",
          "Key": "aws:cloudformation:logical-id",
          "Value": "ASG",
          "PropagateAtLaunch": true
        },
        {
          "ResourceId": "#######-ASG-#########",
          "ResourceType": "auto-scaling-group",
          "Key": "aws:cloudformation:stack-id",
          "Value": "arn:aws:cloudformation:eu-west-1:########:stack/##############",
          "PropagateAtLaunch": true
        },
        {
          "ResourceId": "################",
          "ResourceType": "auto-scaling-group",
          "Key": "aws:cloudformation:stack-name",
          "Value": "#######",
          "PropagateAtLaunch": true
        }
      ],
      "TerminationPolicies": [
        "Default"
      ],
      "NewInstancesProtectedFromScaleIn": false
    }
  ]
}

我需要获得"SuspendedProcesses":[{"ProcessName"的价值:(见上文）

然后，如果"ProcessName" == "Terminate"的值（如上所述）执行此操作，则执行此操作。

我知道如何构造if else语法，但如何预先从JSON输出中建立"ProcessName"的值？

我也知道如何操作在脚本中创建的数组，但我在这里遇到困难，因为json对象是由test()函数创建的，所以正常的规则似乎不是应用

任何帮助将不胜感激。 感谢

Answer 1

首先，使用return语句替换console.log（）调用。那你就可以做到

var json = test();
var processes = json["AutoScalingGroups"][0]["Suspended Processes"]

更新代码：

function test() { 
    autoscaling.describeAutoScalingGroups(params, function(err, data) { 
        if (err) {
            return [err, err.stack]; // an error occurred 
        } else {
            var json = JSON.stringify(data); // successful response 
            return json["AutoScalingGroups"][0]["Suspended Processes"];
        }
    }); 
} 
var processes = test()
console.log(processes); 

Answer 2

感谢@RobbieMilejczak，解决了问题：

首先，使用return语句替换console.log（）调用。那你就可以做到

var json = test();
var processes = json["AutoScalingGroups"][0]["Suspended Processes"]
updated code:

function test() { 
    autoscaling.describeAutoScalingGroups(params, function(err, data) { 
        if (err) {
            return [err, err.stack]; // an error occurred 
        } else {
            var json = JSON.stringify(data); // successful response 
            return json["AutoScalingGroups"][0]["Suspended Processes"];
        }
    }); 
} 
var processes = test()
console.log(processes);