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                >[danger]什么是單向數據綁定 **** 1. 數據的流向由 model -> controller -> view, 默認一個方向, 可以在C里實現雙向 ![](https://box.kancloud.cn/99ee88197183195ebdf3cd308ce328b4_712x400.png) 2. 例如: controller控制view顯示, 而view上修改無法同步model數據, 而且model修改也無法同步view數據(可以在控制臺修改model的值, view是無法改變的) ``` <body> <div> <!--view--> <p>你的年齡現在: <input id="result" /></p> </div> <script> // model let model = { age: 18 }; // controller document.getElementById("result").value = model.age; // 注意: 在input輸入框中, 修改值, 并不會影響model數據的同步改變 </script> </body> ```
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