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javascript - 从对象 javascript es6 中获取值

问题描述

  let parameters = {
    "lifespanCount": 3,
    "parameters": {
      "fields": {
        "date.original": {
          "stringValue": "tomorrow",
          "kind": "stringValue"
        },
        "duration.original": {
          "stringValue": "3 days",
          "kind": "stringValue"
        },
        "date": {
          "structValue": {
            "fields": {
              "sys.date.recent.original": {
                "stringValue": "tomorrow",
                "kind": "stringValue"
              },
              "sys.date.original": {
                "stringValue": "tomorrow",
                "kind": "stringValue"
              },
              "sys.date": {
                "stringValue": "2018-12-11T12:00:00-05:00",
                "kind": "stringValue"
              },
              "sys.date.recent": {
                "stringValue": "2018-12-11T12:00:00-05:00",
                "kind": "stringValue"
              },
              "sys.date.partial": {
                "stringValue": "2018-12-11T12:00:00-05:00",
                "kind": "stringValue"
              },
              "sys.date.partial.original": {
                "stringValue": "tomorrow",
                "kind": "stringValue"
              }
            }
          },
          "kind": "structValue"
        },
        "yes.original": {
          "stringValue": "",
          "kind": "stringValue"
        },
        "duration": {
          "structValue": {
            "fields": {
              "sys.duration.object": {
                "structValue": {
                  "fields": {}
                },
                "kind": "structValue"
              },
              "sys.duration": {
                "structValue": {
                  "fields": {
                    "unit": {
                      "stringValue": "day",
                      "kind": "stringValue"
                    },
                    "amount": {
                      "numberValue": 3,
                      "kind": "numberValue"
                    }
                  }
                },
                "kind": "structValue"
              },
              "sys.duration.original": {
                "stringValue": "3 days",
                "kind": "stringValue"
              }
            }
          },
          "kind": "structValue"
        },
        "location.original": {
          "stringValue": "china",
          "kind": "stringValue"
        },
        "location": {
          "structValue": {
            "fields": {
              "sys.geo-country.original": {
                "stringValue": "china",
                "kind": "stringValue"
              },
              "sys.geo-country.object": {
                "structValue": {
                  "fields": {}
                },
                "kind": "structValue"
              },
              "sys.geo-country": {
                "stringValue": "China",
                "kind": "stringValue"
              }
            }
          },
          "kind": "structValue"
        }
      }
    }
  }

从上面的对象中获取值的最佳方法是什么，

let date = parameters.fields['date'].structValue.fields['sys.date'].stringValue;
let country = parameters.fields['location'].structValue.fields['sys.geo-country'].stringValue

什么可以是一个常见的功能，所以如果我尝试过传递对象和密钥，任何人都可以直接访问值object.values()，object.keys()也阅读过 MDN 文档，但对此没有更多了解。我的目标是当我通过对象传递任何键时从对象中获取值。

标签： javascriptobject

解决方案

Based purely on your two examples, the easiest way seems to be:

function getString(paramField, structField) {
  if (parameters.fields[paramField] && parameters.fields[paramField].structValue.fields[structField]) {
  return parameters.fields[paramField].structValue.fields[structField].stringValue;
  } 
  return '';
}

Maybe some additional checks are in order, depending on the likelihood of other variance to the structure.

Then the calling code can just be:

let date = getString('date', 'sys.date');

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