html - 遍历 Json 对象

Question

我有以下 JSON 对象

var s = {
    "TenantGroupName": "Fun Holidays",
    "queue_details": [{
        "queue_key": "1",
        "channelId": "1",
        "queue_name": "North India Travel",
        "contacts": [{
            "from": "meenar@interactcrm.com",
            "subject": "Redemption Coupon",
            "queue_time": "2:34",
            "service_level_breached": "false",
            "cduId": "4f8b9f2322c60106c0a800bd65cc0000",
            "contactPkey": "8903"
        }, {
            "from": "sagarm@interactcrm.com",
            "subject": "Redemption Coupon",
            "queue_time": "2:34",
            "service_level_breached": "false",
            "cduId": "4f8b9f2322c60106c0a800bd65cc0000",
            "contactPkey": "8903"
        }, {
            "from": "kaushalk@interactcrm.com",
            "subject": "Redemption Coupon",
            "queue_time": "2:34",
            "service_level_breached": "false",
            "cduId": "4f8b9f2322c60106c0a800bd65cc0000",
            "contactPkey": "8903"
        }, {
            "from": "kaushalk@interactcrm.com",
            "subject": "Redemption Coupon",
            "queue_time": "8:05",
            "service_level_breached": "true",
            "cduId": "4f8b9f2322c60106c0a800bd65cc0000",
            "contactPkey": "8903"
        }, {
            "from": "kaushalk@interactcrm.com",
            "subject": "Redemption Coupon",
            "queue_time": "8:34",
            "service_level_breached": "true",
            "cduId": "4f8b9f2322c60106c0a800bd65cc0000",
            "contactPkey": "8903"
        }]
    }, {
        "queue_key": "1",
        "channelId": "1",
        "queue_name": "South India Travel",
        "contacts": []
    }, {
        "queue_key": "1",
        "channelId": "1",
        "queue_name": "Summer 2012",
        "contacts": [{
            "from": "meenar@interactcrm.com",
            "subject": "Redemption Coupon",
            "queue_time": "2:34",
            "service_level_breached": "false",
            "cduId": "4f8b9f2322c60106c0a800bd65cc0000",
            "contactPkey": "8903"
        }, {
            "from": "raheels@interactcrm.com",
            "subject": "Redemption Coupon",
            "queue_time": "2:34",
            "service_level_breached": "false",
            "cduId": "4f8b9f2322c60106c0a800bd65cc0000",
            "contactPkey": "8903"
        }, {
            "from": "sagarm@interactcrm.com",
            "subject": "Redemption Coupon",
            "queue_time": "2:34",
            "service_level_breached": "false",
            "cduId": "4f8b9f2322c60106c0a800bd65cc0000",
            "contactPkey": "8903"
        }, {
            "from": "kaushalk@interactcrm.com",
            "subject": "Redemption Coupon",
            "queue_time": "9:34",
            "service_level_breached": "true",
            "cduId": "4f8b9f2322c60106c0a800bd65cc0000",
            "contactPkey": "8903"
        }]
    }, {
        "queue_key": "1",
        "channelId": "3",
        "queue_name": "Honeymoon",
        "contacts": [{
            "from": "Henry Williams",
            "subject": "New Zealand",
            "queue_time": "1:45",
            "service_level_breached": "false",
            "cduId": "4f8b9f2322c60106c0a800bd65cc0000",
            "contactPkey": "8903"
        }, {
            "from": "Linda Simpson",
            "subject": "Redemption Coupon",
            "queue_time": "2:34",
            "service_level_breached": "false",
            "cduId": "4f8b9f2322c60106c0a800bd65cc0000",
            "contactPkey": "8903"
        }]
    }, {
        "queue_key": "1",
        "channelId": "7",
        "queue_name": "Feedback_SMS",
        "contacts": [{
            "from": "@sanjeev",
            "subject": "Maldives",
            "queue_time": "1:45",
            "service_level_breached": "false",
            "cduId": "4f8b9f2322c60106c0a800bd65cc0000",
            "contactPkey": "8903"
        }]
    }, {
        "queue_key": "1",
        "channelId": "5",
        "queue_name": "Feedback_Twitter",
        "contacts": [{
            "from": "9833202859",
            "subject": "Wish to travel ...",
            "queue_time": "1:45",
            "service_level_breached": "false",
            "cduId": "4f8b9f2322c60106c0a800bd65cc0000",
            "contactPkey": "8903"
        }]
    }]
}

我想遍历上面的 JSON 数组。我用 Javascript 编写了以下内容

我将上面的 JSON 对象传递给 Javascript，如下所示

function CreateQueue(jString) {
    var jSonString = { "MyQueue": jString };
    alert(jSonString.MyQueue.length);
}

以上函数提示:undefined。我怎样才能遍历上面的 JSON 字符串？

Answer 1

整个构造是一个对象，而不是数组，因此您不能对其调用 .length。我也不明白为什么要将它包装到一个完全没有用的附加对象中。

要遍历对象的所有属性，请执行以下操作:

for (var key in jString) {
   if (jString.hasOwnProperty(key) ){
       console.log( "key:"+key+", val:"+jString[key] );
   }
}

要遍历数组，请执行以下操作:

for (var i = 0; i < s.queue_details.length; i++){
  console.log( i+":"+s.queue_details[i] );
}