javascript深拷贝和浅拷贝

   const _ = require('lodash');
   const obj1 = {    a: 1,    b: { f: { g: 1 } },    c: [1, 2, 3]};
   const obj2 = _.cloneDeep(obj1);console.log(obj1.b.f === obj2.b.f);

function deepClone(val) {
  return new Promise(resolve => {
    const { port1, port2 } = new MessageChannel()
    port2.onmessage = e => resolve(e.data)
    port1.postMessage(val)
  })
}

function deepClone(target) {
 let cloneTarget = {};
 const keys=Object.keys(target)
 for (const key of keys) {
     cloneTarget[key] = target[key];
 }
 return cloneTarget;
};

function deepClone(target) {
 if(typeof target==='object'){
     let cloneTarget = Array.isArray(target) ? [] : {};
     const keys = Object.keys(target)
     for (const key of keys) {
         cloneTarget[key] = deepClone(target[key]);
     }
     return cloneTarget;
 }else {
     return target
 }
};

function deepClone(target,map = new Map()) {
 if(typeof target==='object'){
     let cloneTarget = Array.isArray(target) ? [] : {};
     if (map.has(target)) {
         return target;
     }
     map.set(target, cloneTarget);
     const keys = Object.keys(target)
     for (const key of keys) {
         cloneTarget[key] = deepClone(target[key],map);
     }
     return cloneTarget;
 }else {
     return target
 }
};

function deepClone(target, map = new WeakMap()) {
 if (typeof target === 'object') {
     if (target === null) {//null
         return null
     }
     if(target instanceof Date){
         return target
     }
     let cloneTarget = Array.isArray(target) ? [] : {};
     if (map.has(target)) {
         return target;
     }
     map.set(target, cloneTarget);
     const keys = Object.keys(target)
     for (const key of keys) {
         cloneTarget[key] = deepClone(target[key], map);
     }
     return cloneTarget;
 } else {
     return target
 }
}