js中的深克隆与浅克隆

浅克隆：原始类型按值传递，对象类型按引用传递，与原对象共用一处内存，修改会使原对象也修改

var lilei={
    sname:"li lei",
    sage:12,
    address:{
      city:"xian",
      street:"未央区"
    }
  }
  function clone(oldObj){
    if(oldObj==null){return null};
    if(typeof oldObj!=="Object"){return oldObj}
    var newObj = Array.isArray(oldObj)?[]:{};
    for(var key in oldObj){
      newObj[key] = oldObj[key]
    }
    return newObj;
  }
  var lilei2 = clone(lilei);
  console.log(lilei===lilei2)//true
  console.log(lilei);
  console.log(lilei2)
  lilei2.sname="李雷"
  console.log(lilei.sname);//李雷
  lilei2.address.city="beijing";
  console.log(lilei.address.city);//beijing 很明显原对象的属性值已被修改

深克隆：在内存中开辟一块新内存，将原对象中的所有值全部复制过去，与原对象完全脱离，修改新对象中的属性值不会影响原对象、

var hmm={
    sname:"han meimei",
    sage:15,
    address:{
      city:"shenzhen",
      street:"林湖区"
    }
  }
  function clone2(oldObj){
    var newObj = Array.isArray(oldObj)?[]:{};
    for(var key in oldObj){
      if(typeof oldObj[key] !=="object"){
        newObj[key]=oldObj[key]
      }else{
        newObj[key]=clone2(oldObj[key])
      }
    }
    return newObj;
  }
  var hmm2=clone2(hmm);
  console.log(hmm,hmm2);
  console.log(hmm===hmm2);//false 
  hmm2.sname="韩梅梅"
  hmm2.address.city="xian";
  console.log(hmm.sname);//还是han meimei 原对象没变
  console.log(hmm.address.city);//还是shenzhen 原对象没变