JavaScript对象深度克隆实现与原理分析

var student = {
  name:"yxz",
  age:25
}
var newStudent = student;
newStudent.sex = "male";
console.log(student); //{name:"yxz",age:25,sex:"male"}

深度克隆的实现方案与兼容处理

var cloneObj = function(obj){
  var str, newobj = obj.constructor === Array ? [] : {};
  if(typeof obj !== 'object'){
    return;
  } else if(window.JSON){
    str = JSON.stringify(obj), //序列化对象
    newobj = JSON.parse(str); //还原
  } else {
    for(var i in obj){
      newobj[i] = typeof obj[i] === 'object' ? cloneObj(obj[i]) : obj[i]; 
    }
  }
  return newobj;
};
//测试
var student = {
  name:"yxz",
  age:25,
  sex:"male"
};
//执行深度克隆
var newStudent = cloneObj(student);
delete newStudent.sex;
console.log(newStudent); //{name:"yxz",age:25}
console.log(student); //{name:"yxz",age:25,sex:"male"}