源碼：

function isObj(x){ var type = typeof x;return x !== null && (type === 'object' || type === 'function'); }var hasOwnProperty = Object.prototype.hasOwnProperty; var propIsEnumerable = Object.prototype.propertyIsEnumerable;function toObject(val) {if (val === null || val === undefined) {throw new TypeError('Cannot convert undefined or null to object');}return Object(val); }function assignKey(to, from, key) {var val = from[key];if (val === undefined || val === null) {return;}if (hasOwnProperty.call(to, key)) {if (to[key] === undefined || to[key] === null) {throw new TypeError('Cannot convert undefined or null to object (' + key + ')');}}if (!hasOwnProperty.call(to, key) || !isObj(val)) {to[key] = val;} else {to[key] = assign(Object(to[key]), from[key]);} }function assign(to, from) {if (to === from) {return to;}from = Object(from);for (var key in from) {if (hasOwnProperty.call(from, key)) {assignKey(to, from, key);}}if (Object.getOwnPropertySymbols) {var symbols = Object.getOwnPropertySymbols(from);for (var i = 0; i < symbols.length; i++) {if (propIsEnumerable.call(from, symbols[i])) {assignKey(to, from, symbols[i]);}}}return to; }function deepAssign(target) {target = toObject(target);for (var s = 1; s < arguments.length; s++) {assign(target, arguments[s]);}return target; };

　　

調用：

deepAssign({a: {b: 0}}, {a: {b: 1, c: 2}}, {a: {c: 3}}); //=> {a: {b: 1, c: 3}}

　　

轉載于:https://www.cnblogs.com/wln3344/p/5601556.html

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