如何通过键合并两个对象值

试图查看是否有任何javascript库function可以合并两个json对象的特定键的值

var x ={ "student-marks":{'math':1,'physics':5} }; var y ={ "student-marks":{'chemistry':3,'history':2} }; 

使用$ .extend和$ .merge给出以下结果

 $.extend({},x,y) leads to { "student-marks":{'chemistry':3,'history':2} } $.merge(x,y) leads to { "student-marks":{'math':1,'physics':2} } 

我要找的是{ { "student-marks":{'math':1,'physics':5, 'chemistry':3,'history':2} }‍

Answer 1

你需要深度扩展

 $.extend(true, {}, x, y); 

查看jQuery.extend的文档（[ deep ]， target ， object1 [， objectN ]）

Answer 2

不依赖jQuery的简单javascript函数将帮助您合并两个具有嵌套对象的JSON对象。

 function mergeJSON(source1,source2){ /* * Properties from the Souce1 object will be copied to Source2 Object. * Note: This method will return a new merged object, Source1 and Source2 original values will not be replaced. * */ var mergedJSON = Object.create(source2);// Copying Source2 to a new Object for (var attrname in source1) { if(mergedJSON.hasOwnProperty(attrname)) { if ( source1[attrname]!=null && source1[attrname].constructor==Object ) { /* * Recursive call if the property is an object, * Iterate the object and set all properties of the inner object. */ mergedJSON[attrname] = mergeJSON(source1[attrname], mergedJSON[attrname]); } } else {//else copy the property from source1 mergedJSON[attrname] = source1[attrname]; } } return mergedJSON; } 

Answer 3

  https://gist.github.com/samad-aghaei/7250ffb74ed80732debb1cbb14d2bfb0 
 /** This script can merge two multi dimensional associative array/objects in javascript by comparing given object with its reference and will remove additional given keys, adding missed parameteres and also validating values without overhead. Also it will return the default values if no input presented with re-usable reference! Tested on IE8 and greater. **/ var module = (function(){ //To make our reference variable onchangable, have to put it into a function which is fster and more efficient than "JSON.parse(JSON.stringify(VARIABLE))" var _defs = function(){ return { //string, number and boolean are actually regex based validation keys on input values. 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'] } } var _validation = { number: function (defaultValue, userValue) { if(/^[0-9]+$/.test(userValue)) //Only numbers allowed return userValue; else return defaultValue; }, string: function (defaultValue, userValue) { if(/^[a-zA-Z\s]*$/.test(userValue)) //Only A to Z case insentitive with space aloowed. return userValue; else return defaultValue; }, boolean: function (defaultValue, userValue) { if(typeof userValue === 'boolean') //True or False or 0 ,1 return userValue; else return defaultValue; } } var _uniqueMerge = function(opts, _ref){ for(var key in _ref) if (_ref && _ref[key] && _ref[key].constructor && _ref[key].constructor === Object) _ref[key] = _uniqueMerge((opts ? opts[key] : null ), _ref[key] ); else if(opts && opts.hasOwnProperty(key)) _ref[key] = _validation[_ref[key][0]](_ref[key][1], opts[key]); //or without validation on user enties => ref[key] = obj[key] else _ref[key] = _ref[key][1]; return _ref; } var _get = function(inputs){ return _uniqueMerge(inputs, _defs()); } return { options: function(){ return _get(arguments[0] || null); // for more safety and control on number of input variables! used --> ( arguments[0] || null ) } } })(); //How to use it: input_one = { a : "Hello World", //b : ["number", 400], //User missed this parameter c: "Hi", d : { da : false, db : "Hellow! World", // ! is not allowed dc : { dca : 10, dcb : "My String", dcc: "3thString", dcd : false }, dce: "ANOTHER STRING", }, e: 40, f: true, z: 'x' }; console.log( JSON.stringify( module.options(input_one), null ,2 ) ); //Output: /* { "a": "Hello World", "b": 300, "c": true, "d": { "da": false, "db": "Defaul value for \"db\"", "dc": { "dca": 10, "dcb": "My String", "dcc": 500, "dcd": false }, "dce": "ANOTHER STRING" }, "e": 40, "f": true, "g": "This is an internal extra parameter" } */ input_two = { a : 32, //b : ["number", 400], //User missed this parameter c: "Hi", d : { da : false, db : "HelloWorld", dc : { dca : 10, dcb : "My String", dcd : false }, dce: 73, } }; console.log( JSON.stringify( module.options(input_two), null ,2 ) ); //output /* { "a": "Defaul value for \"a\"", "b": 300, "c": true, "d": { "da": false, "db": "HelloWorld", "dc": { "dca": 10, "dcb": "My String", "dcc": 500, "dcd": false }, "dce": "Default value for \"dce\"" }, "e": 200, "f": 0, "g": "This is an internal extra parameter" } */ //Empty input will return the default values! console.log( JSON.stringify( module.options(), null ,2 ) ); //Output /* { "a": "Defaul value for \"a\"", "b": 300, "c": true, "d": { "da": true, "db": "Defaul value for \"db\"", "dc": { "dca": 200, "dcb": "Default value for \"dcb\"", "dcc": 500, "dcd": true }, "dce": "Default value for \"dce\"" }, "e": 200, "f": 0, "g": "This is an internal extra parameter" } */
 

Answer 4

稍微冗长一点。

 answer = { "student-marks": Object.assign(x['student-marks'], y['student-marks']) } 

• 警告这对x有副作用。

Answer 5

此函数对两个JSON对象进行深度合并并返回结果。

 function mergeObjects (obj1, obj2) { if(!obj1 && !obj2) return null; if(!obj1) return JSON.parse(JSON.stringify(obj2)); if(!obj2) return JSON.parse(JSON.stringify(obj1)); var merged = { }; for (var key1 in obj1) { if (obj2[key1]) { merged[key1] = mergeObjects(obj1[key1], obj2[key1]) } else { merged[key1] = obj1[key1]; } } for (var key2 in obj2) { if (!obj1[key2]) { merged[key2] = obj2[key2]; } } return merged; };