hannah

```js function _instanceOf(left, right) { const rightProto = right.prototype; left = left.__proto__ while(left.__proto__ !== null) { if(rightProto === left) { return true; } left = left.__proto__; } return false }...

```js let obj = { a: 1, b: 2, c: { c: 1, d: 2 } } // 方法一 let obj1 = JSON.parse(JSON.stringify(obj)) // 测试用例 // console.log(obj1); // obj1.b =...