vue 双向绑定

<iframe height='265' scrolling='no' src='//codepen.io/zd9027/embed/EKMOZp/?height=265&theme-id=0&default-tab=html,result&embed-version=2' frameborder='no' allowtransparency='true' allowfullscreen='true' style='width: 100%;'>See the Pen <a href='http://codepen.io/zd9027/pen/EKMOZp/'>vue 双向绑定</a> by zd9027 (<a href='http://codepen.io/zd9027'>@zd9027</a>) on <a href='http://codepen.io'>CodePen</a>.
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