JSONPath模板是由{}大括号括起来的JSONPath表达式组成。除了原始的JSONPath语法之外，我们还添加了三个函数：

• 可选的$操作符，因为表达式总是默认从根对象开始。
• 用""双引号来引用JSONPath表达式中的文本
• 使用range操作符来迭代List。
  result对象被打印成String()函数。

输出结果：

{
  "kind": "List",
  "items":[
    {
      "kind":"None",
      "metadata":{"name":"127.0.0.1"},
      "status":{
        "capacity":{"cpu":"4"},
        "addresses":[{"type": "LegacyHostIP", "address":"127.0.0.1"}]
      }
    },
    {
      "kind":"None",
      "metadata":{"name":"127.0.0.2"},
      "status":{
        "capacity":{"cpu":"8"},
        "addresses":[
          {"type": "LegacyHostIP", "address":"127.0.0.2"},
          {"type": "another", "address":"127.0.0.3"}
        ]
      }
    }
  ],
  "users":[
    {
      "name": "myself",
      "user": {}
    },
    {
      "name": "e2e",
      "user": {"username": "admin", "password": "secret"}
    }
  ]
}

|Function|Description|Example|Result
|text|the plain text|kind is {.kind}|kind is List
|@|the current object|{@}|the same as input
|. or []|child operator|{.kind} or {[‘kind’]}|List
|..|recursive descent|{..name}|127.0.0.1 127.0.0.2 myself e2e
||wildcard. Get all objects|{.items[].metadata.name}|[127.0.0.1 127.0.0.2]
|[start:end :step]|subscript operator|{.users[0].name}|myself
|[,]|union operator|{.items[][‘metadata.name’, ‘status.capacity’]}|127.0.0.1 127.0.0.2 map[cpu:4] map[cpu:8]
|?()|filter|{.users[?(@.name==”e2e”)].user.password}|secret
|range, end|iterate list|{range .items[]}[{.metadata.name}, {.status.capacity}] {end}|[127.0.0.1, map[cpu:4]] [127.0.0.2, map[cpu:8]]
|””|quote interpreted string|{range .items[*]}{.metadata.name}{“\t”}{end}|127.0.0.1 127.0.0.2

原文: http://docs.kubernetes.org.cn/67.html