js实现深度复制代码

 function clone(obj) {
 if(obj == null) return null;
 let newObj = obj instanceof Array ? [] : {};
 for(var i in obj) {
 newObj[i] = typeof obj[i] == "object" ? clone(obj[i]) : obj[i];
 }
 return newObj;
 }

 const clone2 = (obj) => {
 let proto = Object.getPrototypeOf(obj);
 return Object.assign({}, Object.create(proto), obj)
 }