javascript - 如何使用 JavaScript 或 jQuery 在多维 JSON 对象中找到特定节点的最大值

Question

这是我正在使用的对象的一个​​简短示例。

{
    "myservices": [
        {
            "name": "oozie",
            "hostidn": "1",
            "details": "failed process health monitor....",
            "currstatus": "Warning",
            "currstatusclass": "warning"
        },
        {
            "name": "oozie",
            "hostidn": "2",
            "details": "failed process health monitor....",
            "currstatus": "Warning",
            "currstatusclass": "warning"
        },
        {
            "name": "oozie",
            "hostidn": "3",
            "details": "failed process health monitor....",
            "currstatus": "Warning",
            "currstatusclass": "warning"
        },
        {
            "name": "oozie",
            "hostidn": "4",
            "details": "failed process health monitor....",
            "currstatus": "Warning",
            "currstatusclass": "warning"
        },
        {
            "name": "oozie",
            "hostidn": "5",
            "details": "failed process health monitor....",
            "currstatus": "Warning",
            "currstatusclass": "warning"
        },
        {
            "name": "single-namenode",
            "hostidn": "2",
            "details": "failed process health monitor....",
            "currstatus": "Warning",
            "currstatusclass": "warning"
        }
    ]
}

在遍历所有这些并显示它们之前，我最终想找到最高的“hostidn”是什么。 hostidn 是第 N 个数字，它可以是唯一的数字，也可以是数百深，中间有几个重复的数字。我的目标是找到最高的那个，并根据它做一个 for 或 while 循环，将它们组合在一起进行视觉显示。示例注意，我在下面有一个编号为 2 的 hostidn，而其余的都有自己的。我想将两者与 2 一起放在一个框中进行显示，但在这种情况下有 5 个不同的 hostidn。我不知道，也许我想错了，不过我会采纳建议。

Answer 1

你可以遵循的基本算法

像这样声明一个变量并将其设置为零

$currentHighest=0;

然后遍历 json 数组并在每次迭代中将 hostidn 的值与 $currentHighest 比较，如果该值高于 中已经存在的值>$currentHighest 将该值设置为 $currentHighest

$currentHighest=0;
 $(data.myservices).each(function(index, element){
   if(data.myservices[index].hostidn>$currentHighest)
     $currentHighest=data.myservices[index].hostidn;
  });
//loop ends and `$currentHighest` will have the highest value

在迭代结束时，您将获得 $currentHighest

中的最高值

久经考验

$(function(){
 $.post("highest.json",function(data){
 $currentHighest=0;
  $(data.myservices).each(function(index, element){
   if(data.myservices[index].hostidn>$currentHighest)
     $currentHighest=data.myservices[index].hostidn;
  });
alert($currentHighest);
},'json');
});