Question

我有两个json文件 - data.json和dataForUpdate.json

data.json：

 [{"name": "test",
   "isDefault": true,
   "settings": {
     "type": "Separation",
     "scanner": {
     "brightness": 0,
     "contrast": 0,
     "threshold": 0,
     "isDuplex": false,
      },
     "image": {
     "invertImage": false,
     "autoRotate": true,
     "rotateValue": -180
     }
    }
 }]

dataForUpdate.json：

  [{"name": "other",
   "isDefault": false,
   "settings": {
     "scanner": {
     "brightness": 100,
     "contrast": 50,
      },
     "image": {
     "autoRotate": false,
     "rotateValue": 0
     }
    }
 }]

我需要使用第二个值更新第一个json。如果没有JSON.parse和hardcodded替换，我怎么能这样做。

Answer 1

你看过Object.assign了吗？你可以这样做：

var data = [{"name": "test",
   "isDefault": true,
   "settings": {
     "type": "Separation",
     "scanner": {
     "brightness": 0,
     "contrast": 0,
     "threshold": 0,
     "isDuplex": false,
      },
     "image": {
     "invertImage": false,
     "autoRotate": true,
     "rotateValue": -180
     }
    }
 }]

var dataForUpdate =   [{"name": "other",
   "isDefault": false,
   "settings": {
     "scanner": {
     "brightness": 100,
     "contrast": 50,
      },
     "image": {
     "autoRotate": false,
     "rotateValue": 0
     }
    }
 }]

Object.assign(data[0], dataForUpdate[0]);

浏览器兼容性

Chrome - 45 +
Firefox - 34 +
Internet Explorer - 不支持
Edge - 所有版本
Opera - 32 +
Safari - 9 +

Answer 2

不使用任何方法，您可以迭代json并更新匹配键并以递归方式调用对象。

var data = {"name": "test",
   "isDefault": true,
   "settings": {
     "type": "Separation",
     "scanner": {
     "brightness": 0,
     "contrast": 0,
     "threshold": 0,
     "isDuplex": false,
      },
     "image": {
     "invertImage": false,
     "autoRotate": true,
     "rotateValue": -180
     }
    }
 }
 
var dataForUpdate = {"name": "other",
   "isDefault": false,
   "settings": {
     "scanner": {
     "brightness": 100,
     "contrast": 50,
      },
     "image": {
     "autoRotate": false,
     "rotateValue": 0
     }
    }
 }
 
 var update = function(a, b) {
  for(key in a) {
    if(b[key] !== undefined) {
      if(typeof b[key] === 'object') {
        update(a[key],b[key]);
      } else {
        a[key] = b[key];
      }
    }
  }
 }
 update(data, dataForUpdate);
 console.log(data);

Answer 3

如果您使用的是jQuery，那么您也可以使用jQuery extend。

喜欢这个

var data = [{"name": "test",
   "isDefault": true,
   "settings": {
     "type": "Separation",
     "scanner": {
     "brightness": 0,
     "contrast": 0,
     "threshold": 0,
     "isDuplex": false,
      },
     "image": {
     "invertImage": false,
     "autoRotate": true,
     "rotateValue": -180
     }
    }
 }];
 var update = [{"name": "other",
   "isDefault": false,
   "settings": {
     "scanner": {
     "brightness": 100,
     "contrast": 50,
      },
     "image": {
     "autoRotate": false,
     "rotateValue": 0
     }
    }
 }];
 
 $.extend(data[0],update[0]);
 console.log(data);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

如何更新nodejs中的全部或大部分JSON值？

3 个答案: