Vue

HTML

<div id="app">
  <h2>Todos:</h2>
  
  Simple Item:
  <input type="checkbox" v-model="myObject.done" />
  {{ myObject.done }}
  
  <hr/>
  
  <ol>
    <li v-for="todo in todos">
      <label>
        <input type="checkbox"
          v-model="todo.done" @change="onTodoChange(todo, $event)">

        <del v-if="todo.done">
          {{ todo.text }}
        </del>
        <span v-else>
          {{ todo.text }}
        </span>
      </label>
    </li>
  </ol>
</div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

del {
  color: rgba(0, 0, 0, 0.3);
}

Vue

var vm = new Vue({
  el: "#app",
  data: {
  	myObject: { done: true },
    todos: [
      { text: "Learn JavaScript", done: false },
      { text: "Learn Vue", done: false },
      { text: "Play around in JSFiddle", done: true },
      { text: "Build something awesome", done: true }
    ]
  },
  methods: {
  	onTodoChange(todo, $event) {
    	console.log($event.target.checked); // no racing, https://github.com/vuejs/vue/issues/293
    }
  }
});

//This works wonderfully on non list items
vm.$watch("myObject.done", function(val)
{
	console.log("myObject.done changed", val);
});

//How do I monitor changes to the done property of any of the todo items?
vm.$watch("todos[*].done", function(val)
{
	console.log("todos.done changed", val);
})