使用js实现一个简单的数据双向绑定

<input type="text" id="foo">
<button id="btn">提交</button>
<button id="btn1">设置</button>
<div>输入框的内容：<input type="text" id="xianshi"></div>
<script>
    var user = {};
    var foo = document.getElementById("foo");
    var xianshi = document.getElementById("xianshi");
    Object.defineProperty(user, ‘name‘, {
        get: function () {
            return document.getElementById(‘foo‘).value;
        },
        set: function (newValue) {
            console.log(newValue);
            document.getElementById(‘foo‘).value = newValue;
        },
        configurable: true
    });
    foo.oninput = function () {
        xianshi.value = user.name;
    }
    xianshi.oninput = function () {
        user.name = xianshi.value;
        xianshi.innerHTML = user.name;
    }
</script>