Method 1 JSON Method

const objCopy = JSON.parse(JSON.stringify(obj));

This method function cannot be copied

Method 2 recursive

// source  Copy the object 
function deepClone(source) {
    
// .constructor Constructor pointing to the object 
  const targetObj = source.constructor === Arry? [] : {
    };
 //  Traversing objects or arrays 
  for(let key in source) {
    
 // obj.hasOwnProperty()  Indicates whether the specified property exists in the object's own property 
    if（source.hasOwnProperty(key)) {
     
 //  Judge whether the attribute exists , And whether it is an object , Is the further traversal of the object , Non object direct assignment , There is no attribute and it is not executed 
     if(source[key] && typeof(source[key]) ==='object') {
    
   //  Maintenance layer code   Further judgment source[key]  Running code can remove 
         targetObj[key] = source[key].constructor === Arry? []: {
    }
    //  recursive 
         targetObj[key] = deepClone(source[key])
     }else{
    
   // source[key] Direct assignment when not an object 
       targetObj[key]= source[key]
     }
   }
  }
 return targetObj 
}