Vue实现双向数据绑定

var data = { value: 'hello world!'}var bindValue;//确定绑定的元素var bindelems = [document.getElementById('p'), document.getElementById('input')];//修改绑定元素的值的方法var command = { text: function(str) { this.innerHTML = str; }, value: function(str) { this.value = str; }};//遍历绑定元素修改其值var scan = function() { console.log('in scan'); for(var i = 0; i < bindelems.length; i++) { var elem = bindelems[i]; console.log('elem',elem); for(var j = 0; j < elem.attributes.length; j++) { var attr = elem.attributes[j]; if(attr.nodeName.indexOf('q-')>=0) { command[attr.nodeName.slice(2)].call(elem, data[attr.nodeValue]); } } }}//设置劫持var defineGetAndSet = function(obj, propname) { Object.defineProperty(obj, propname, { get: function() { return bindValue; }, set: function(value){ bindValue = value; scan(); }, enumerable: true, configurable: true })} //一开始先初始化，使所有绑定的元素值为初始值scan();//设置需要被劫持的元素defineGetAndSet(data, 'value');//监听UI变化bindelems[1].addEventListener('keyup', function(e) { data.value = e.target.value;});setTimeout(function() { data.value = 'change';}, 1000);