js中的深克隆與淺克隆

淺克隆：原始類型按值傳遞，對象類型按引用傳遞，與原對象共用一處內存，修改會使原對象也修改

var lilei={
    sname:"li lei",
    sage:12,
    address:{
      city:"xian",
      street:"未央區"
    }
  }
  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 很明顯原對象的屬性值已被修改

深克隆：在內存中開辟一塊新內存，將原對象中的所有值全部復制過去，與原對象完全脫離，修改新對象中的屬性值不會影響原對象、

var hmm={
    sname:"han meimei",
    sage:15,
    address:{
      city:"shenzhen",
      street:"林湖區"
    }
  }
  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="韓梅梅"
  hmm2.address.city="xian";
  console.log(hmm.sname);//還是han meimei 原對象沒變
  console.log(hmm.address.city);//還是shenzhen 原對象沒變