<pre class="shiki github-dark shaku"><code>/** * @param {any} target * @param {any[]} sources * @return {object} */function objectAssign(target, ...sources) { if (target === null || target === undefined) { throw new TypeError('Cannot convert undefined or null to object'); } // 将目标对象转为对象（处理原始值 target） const to = Object(target) for (const source of sources) { if (source === null || source === undefined) continue; const fromObject = Object(source) // 获取所有自有属性键（字符串 + Symbol） const allKeys = [ ...Object.getOwnPropertyNames(fromObject), ...Object.getOwnPropertySymbols(fromObject) ] for (const key of allKeys) { const descriptor = Object.getOwnPropertyDescriptor(fromObject, key) if (!descriptor || !descriptor.enumerable) continue // 只赋值可枚举属性 // 使用 Reflect.set 模拟原生 [[Set]] 行为 // 这会触发目标对象上可能存在的 setter，或在属性只读时失败 const success = Reflect.set(to, key, fromObject[key]) if (!success) { throw new TypeError(`Cannot assign to read only property '${String(key)}'`) } } } return to}</code></pre>

Object.assign()

The Object.assign() method copies all enumerable own properties from one or more source objects to a target object. It returns the target object. (sou…