js浅拷贝与深拷贝

//浅拷贝

var source={
   id:1,
   name:'张三',
   cert:{
      certNo:'211111111',
      certAddress:'北京市昌平区'
   }
}

var target={}
var keys=Object.keys(source);
keys.forEach(function(k,index,arr){
    target[k]=source[k];
})
console.log(target) 

// 深拷贝

var obj={
     name:'22',
     age:12,
     card:['khjh','gg'],
     wife:{
         name:'kkk'
     }
}

var obj1={};

//1 判断是不原始值  typeof（）返回的是不是object
//2 判断是数组还是对象  instanceof toString constructor
//3 建立相应的数组或对象
function deepClone(origin,target){
     var target=target || {},
           toStr=Object.prototype.toString,
           arrStr="[object Array]";
           for(var prop in origin){
                if(origin.hasOwnProperty(prop)){  //判断是不是原型上的属性
                        if(origin[prop] !=="null" && typeof(origin[prop])=='object'){ //引用值
                             target[prop]=toStr.call(origin[prop])==arrStr?[]:{};
                            // if(toStr.call(origin[prop])==arrStr){
                            //     target[prop]=[];
                            // }else{
                            //     target[prop]={};
                            // }
                            deepClone(origin[prop],target[prop]); //递归

                        }else{
                            target[prop]=origin[prop];
                        }

                }
           }

           return target;
}

deepClone(obj,obj1)