深拷贝的方式

1.不支持function----------------------------------

    var obj = {
        name: 'sonia',
        age: 18,
        sub:{
            id:1
        },
        action:function(){
            console.log(this.age);
        }
    }
    var obj2 = JSON.parse(JSON.stringify(obj));
    obj.sub.id = 100;
    console.log(obj2);
    console.log(obj);

2.公共方法--------------------------------------------

    var Animal={
        name: "duobi",
        skin: ["red", "green"],
        child: {
            xxx: "xxx"
        },
        say: function(){
            console.log("I am ", this.name, " skin:", this.skin)
        }
    }
    function deep(dest, obj){
        var o = dest;
        for (var key in obj) {  
            if (typeof obj[key] === 'object'){   //判断是不是对象(是不是数组或对象)
                //constructor判断类型是数组还是对象
                o[key] = (obj[key].constructor===Array)?[]:{};
                deep(o[key], obj[key]);
            } else {
                o[key] = obj[key]
            }
        }
        return o;
    };
    var x = deep({},Animal);
    var y = deep({},Animal);
    x.child.xxx = 'aaaaaa';
    console.log(x);
    console.log(y);