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                            1. `Object.freeze()`，這會阻止修改現有的屬性，也意味著響應系統無法再*追蹤*變化。
~~~
var obj = {
  foo: 'bar'
}

Object.freeze(obj)

new Vue({
  el: '#app',
  data: obj
})
~~~

~~~
<div id="app">
  <p>{{ foo }}</p>
  <!-- 這里的 `foo` 不會更新！ -->
  <button v-on:click="foo = 'baz'">Change it</button>
</div>
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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