let data = {}

const input = document.getElementsByClassName('input')[0];

Object.defineProperty(data,'ss',{

get:function(old){

console.log(123)

},

set:function(value){

console.log('set方法')

this.value = value;

console.log(this.hasOwnProperty('ss'));

console.log(this.ss)

console.log(data);

insert()

}

})

// console.log(typeof(input.value))

//input propertychange

input.onchange = function(e){

 

}

function insert(){

let newEl = document.getElementsByClassName('new')[0];

newEl.innerHTML = data.value

}

input.addEventListener('input', function() {

data.ss = input.value

});