如何测试元素是否在json数据中

Question

我需要检查一个元素是否在json数据中。

JSON数据

{
    "status": {
        "carts": [
            {
                "service": "page-mailer",
                "running": "",
                "last success": "2015-05-07 09:35:31"
            }
        ],
        "pages": [
            {
                "service": "page-mailer",
                "running": "",
                "last success": "2015-05-07 09:35:31"
            }
        ],
        "actions": [
            {
                "service": "page-mailer",
                "running": "",
                "last success": "2015-05-07 09:35:31"
            }
        ],
        "integrations": [],
        "service": [
            {
                "service": "page-mailer",
                "running": "",
                "last success": "2015-05-07 09:35:31"
            }
        ],
        "smtp": [
            {
                "Server": "myserver"
            }
        ],
        "servers": []
    },
    "timing": "2ms"
}

类似的东西，

if(carts){}  
if(pages){} etc

我正在使用jquery getJSON();

Answer 1

下面应该适合你

if(data && data.status && data.status.carts){
   console.log("Exist")
} 

Answer 2

如果你有：

var data = {"status": { "carts": ....... } }

然后检查是否存在carts：

if( data && data.status && data.status.carts ) {
    //do something
}