我已经为我的一个项目写了一个函数，它将对象作为用户选项与其内部克隆进行比较。 它还可以验证，甚至替换默认值，如果用户输入坏类型的数据或删除，在纯javascript。

在IE8中100%有效。测试成功。

//  ObjectKey: ["DataType, DefaultValue"]
reference = { 
    a : ["string", 'Defaul value for "a"'],
    b : ["number", 300],
    c : ["boolean", true],
    d : {
        da : ["boolean", true],
        db : ["string", 'Defaul value for "db"'],
        dc : {
            dca : ["number", 200],
            dcb : ["string", 'Default value for "dcb"'],
            dcc : ["number", 500],
            dcd : ["boolean", true]
      },
      dce : ["string", 'Default value for "dce"'],
    },
    e : ["number", 200],
    f : ["boolean", 0],
    g : ["", 'This is an internal extra parameter']
};

userOptions = { 
    a : 999, //Only string allowed
  //b : ["number", 400], //User missed this parameter
    c: "Hi", //Only lower case or case insitive in quotes true/false allowed.
    d : {
        da : false,
        db : "HelloWorld",
        dc : {
            dca : 10,
            dcb : "My String", //Space is not allowed for ID attr
            dcc: "3thString", //Should not start with numbers
            dcd : false
      },
      dce: "ANOTHER STRING",
    },
    e: 40,
    f: true,
};


function compare(ref, obj) {

    var validation = {
        number: function (defaultValue, userValue) {
          if(/^[0-9]+$/.test(userValue))
            return userValue;
          else return defaultValue;
        },
        string: function (defaultValue, userValue) {
          if(/^[a-z][a-z0-9-_.:]{1,51}[^-_.:]$/i.test(userValue)) //This Regex is validating HTML tag "ID" attributes
            return userValue;
          else return defaultValue;
        },
        boolean: function (defaultValue, userValue) {
          if (typeof userValue === 'boolean')
            return userValue;
          else return defaultValue;
        }
    };

    for (var key in ref)
        if (obj[key] && obj[key].constructor && obj[key].constructor === Object)
          ref[key] = compare(ref[key], obj[key]);
        else if(obj.hasOwnProperty(key))
          ref[key] = validation[ref[key][0]](ref[key][1], obj[key]); //or without validation on user enties => ref[key] = obj[key]
        else ref[key] = ref[key][1];
    return ref;
}

//console.log(
    alert(JSON.stringify( compare(reference, userOptions),null,2 ))
//);

/ *结果

{
  "a": "Defaul value for \"a\"",
  "b": 300,
  "c": true,
  "d": {
    "da": false,
    "db": "Defaul value for \"db\"",
    "dc": {
      "dca": 10,
      "dcb": "Default value for \"dcb\"",
      "dcc": 500,
      "dcd": false
    },
    "dce": "Default value for \"dce\""
  },
  "e": 40,
  "f": true,
  "g": "This is an internal extra parameter"
}

*/

我在Javascript中开发了名为“compareValue()”的函数。 它返回值是否相同。 我在一个对象的for循环中调用了compareValue()。 你可以在diffParams中得到两个对象的差值。

var diffParams = {}; var obj1 = {"a":"1", "b":"2", "c":[{"key":"3"}]}, obj2 = {"a":"1", "b":"66", "c":[{"key":"55"}]}; for( var p in obj1 ){ if ( !compareValue(obj1[p], obj2[p]) ){ diffParams[p] = obj1[p]; } } function compareValue(val1, val2){ var isSame = true; for ( var p in val1 ) { if (typeof(val1[p]) === "object"){ var objectValue1 = val1[p], objectValue2 = val2[p]; for( var value in objectValue1 ){ isSame = compareValue(objectValue1[value], objectValue2[value]); if( isSame === false ){ return false; } } }else{ if(val1 !== val2){ isSame = false; } } } return isSame; } console.log(diffParams);

这只会返回属性改变的新对象。(省略和isEmpty是lodash中的函数)

export const getObjectDifference = <T extends {}>(originalObject: T, newObject: T) => {
const sameProperties: string[] = [];

Object.entries(originalObject).forEach(original => {
    Object.entries(newObject).forEach(newObj => {
        if (original[0] === newObj[0]) {
            if (original[1] === newObj[1])
                sameProperties.push(newObj[0]);
        }
    });
});

const objectDifference: T = omit(newObject, sameProperties) as T;
if (isEmpty(objectDifference))
    return null;
else
    return objectDifference; }

2022年更新:

我想出了一个非常简单的算法来解决大多数边缘情况:

使物体变平 简单地比较两个扁平对象并创建一个扁平的diff对象 平展diff对象

如果你保存了被压平的物体，你就可以重复使用它，并在你真正需要的时候进行“反压平…”

let oldObject = {var1:'value1', var2:{ var1:'value1', var2:'value2'},var3:'value3'};
let newObject = {var2:{ var1:'value11', var3:'value3'},var3:'value3'};

let flatOldObject = flattenObject(oldObject)
/*
{
 'var1':'value1',
 'var2.var1':'value1',
 'var2.var2':'value2',
 'var3':'value3' 
}
*/
let flatNewObject = flattenObject(newObject)
/*
{
 'var2.var1':'value11',
 'var2.var3':'value3',
 'var3':'value3'
}
*/
let flatDiff = diffFlatten(flatOldObject, flatNewObject)
let [updated,removed] = flatDiff
/*
updated = {
 'var2.var1':'value11',
 'var2.var3':'value3'
}
removed = {
'var1':'value1'
}
*/

当然，您可以为这些步骤提供您的实现。但我的想法是:

实现

function flattenObject(obj) {
 const object = Object.create(null);
 const path = [];
 const isObject = (value) => Object(value) === value;

 function dig(obj) {
  for (let [key, value] of Object.entries(obj)) {
    path.push(key);
    if (isObject(value)) dig(value);
    else object[path.join('.')] = value;
    path.pop();
  }
 }

 dig(obj);
 return object;
}

function diffFlatten(oldFlat, newFlat) {
    const updated = Object.assign({}, oldFlat);
    const removed = Object.assign({}, newFlat);

    /**delete the unUpdated keys*/
    for (let key in newFlat) {
        if (newFlat[key] === oldFlat[key]) {
             delete updated[key];
             delete removed[key];
        }
    }

    return [updated, removed];

}

function unflatenObject(flattenObject) {
    const unFlatten = Object.create(null);
    for (let [stringKeys, value] of Object.entries(flattenObject)) {
        let chain = stringKeys.split('.')
        let object = unFlatten

        for (let [i, key] of chain.slice(0, -1).entries()) {
            if (!object[key]) {
                let needArray = Number.isInteger(Number(chain[+i + 1]))
                object[key] = needArray ? [] : Object.create(null)
            }
            object = object[key];
        }
        let lastkey = chain.pop();
        object[lastkey] = value;
    }
    return unFlatten;
}

另一个基于lodash的解决方案，它有点特定于我们想要查看对象更新的diff的情况:

const diff = return {
  old: _.pickBy(oldObject, (value, key) => { return !_.isEqual(value, newObject[key]); }),
  new: _.pickBy(newObject, (value, key) => { return !_.isEqual(oldObject[key], value); })
}

没有使用_。omitBy是因为性能影响。

这是在gisthub上找到的一个修改版本。

isNullBlankOrUndefined = function (o) {
    return (typeof o === "undefined" || o == null || o === "");
}

/**
 * Deep diff between two object, using lodash
 * @param  {Object} object Object compared
 * @param  {Object} base   Object to compare with
 * @param  {Object} ignoreBlanks will not include properties whose value is null, undefined, etc.
 * @return {Object}        Return a new object who represent the diff
 */
objectDifference = function (object, base, ignoreBlanks = false) {
    if (!lodash.isObject(object) || lodash.isDate(object)) return object            // special case dates
    return lodash.transform(object, (result, value, key) => {
        if (!lodash.isEqual(value, base[key])) {
            if (ignoreBlanks && du.isNullBlankOrUndefined(value) && isNullBlankOrUndefined( base[key])) return;
            result[key] = lodash.isObject(value) && lodash.isObject(base[key]) ? objectDifference(value, base[key]) : value;
        }
    });
}