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MM们
ECMAScript 2018标准方法你会使用对象传播：let merged = {...obj1, ...obj2};/** There's no limit to the number of objects you can merge.
* Later properties overwrite earlier properties with the same name. */const allRules = {...obj1, ...obj2, ...obj3};ECMAScript 2015（ES6）标准方法/* For the case in question, you would do: */Object.assign(obj1, obj2);/** There's no limit to the number of objects you can merge.
* All objects get merged into the first object.
* Only the object in the first argument is mutated and returned.
* Later properties overwrite earlier properties with the same name. */const allRules = Object.assign({}, obj1, obj2, obj3, etc);（参见MDN JavaScript参考）ES5和早期的方法for (var attrname in obj2) { obj1[attrname] = obj2[attrname]; }请注意，这会简单地添加的所有属性obj2，以obj1这可能不是你想要什么，如果你仍然想使用未修改obj1。如果你使用的是一个遍布原型的框架，那么你必须得到更好的支票hasOwnProperty，但是这些代码适用于99％的情况。功能示例：/**
* Overwrites obj1's values with obj2's and adds obj2's if non existent in obj1
* @param obj1
* @param obj2
* @returns obj3 a new object based on obj1 and obj2
*/function merge_options(obj1,obj2){
var obj3 = {};
for (var attrname in obj1) { obj3[attrname] = obj1[attrname]; }
for (var attrname in obj2) { obj3[attrname] = obj2[attrname]; }
return obj3;}
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慕姐8265434
在和谐的ECMAScript 2015年（ES6）规定Object.assign，将做到这一点。Object.assign(obj1, obj2);当前的浏览器支持正在变得越来越好，但如果您正在为没有支持的浏览器进行开发，则可以使用polyfill。
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汪汪一只猫
我用google搜索代码来合并对象属性，最后来到这里。但是由于没有任何递归合并代码，我自己写了。（也许jQuery扩展是递归BTW？）无论如何，希望其他人也会觉得它很有用。（现在代码不使用Object.prototype:)码/** Recursively merge properties of two objects */function MergeRecursive(obj1, obj2) { for (var p in obj2) { try { // Property in destination object set; update its value. if ( obj2[p].constructor==Object ) { obj1[p] = MergeRecursive(obj1[p], obj2[p]); } else { obj1[p] = obj2[p]; } } catch(e) { // Property in destination object not set; create it and set its value. obj1[p] = obj2[p]; } } return obj1;}一个例子o1 = { a : 1, b : 2, c : { ca : 1, cb : 2, cc : { cca : 100, ccb : 200 } } };o2 = { a : 10, c : { ca : 10, cb : 20, cc : { cca : 101, ccb : 202 } } };o3 = MergeRecursive(o1, o2);生成对象o3之类的o3 = { a : 10, b : 2, c : { ca : 10, cb : 20, cc : { cca : 101, ccb : 202 } } };
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MMTTMM
请注意，underscore.js' extend-method在单行中执行此操作：_.extend({name : 'moe'}, {age : 50});
=> {name : 'moe', age : 50}