js 复制对象的深复制与浅复制

var baz = {a:‘hello‘, b: {c:‘my‘, d:‘friend‘}}
var foo = baz
foo.a="better"
console.log(foo.a)//better
console.log(baz.a)//better

var baz = {a:‘hello‘, b: {c:‘my‘, d:‘friend‘}}
var foo = {}
var deepCopy= function(obj) { 
var newObj={};
for (var key in obj) {
      newObj[key] = typeof obj[key]===‘object‘? deepCopy(obj[key]): obj[key];
   } 
   return newObj; 
}
foo = deepCopy(obj)
foo.a="better"
console.log(foo.a)//better
console.log(baz.a)//hello