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                            通過外部增加對象的形式，對構造器進行擴展。它和混入非常的類似

# extends我們來看一個擴展的實例

~~~
<body>
    <div id="app">
        {{message}}
        <p>
            <button @click="add">add</button>
        </p>
    </div>
</body>
<script type="text/javascript">
    var bbb = {
        //鉤子函數
        created: function () {
            console.log("我是被擴展出來的");
        },
        methods: {
            add: function () {
                console.log('我是被擴展出來的方法！');
            }
        }
    };
    var app = new Vue({
        el: '#app',
        data: {
            message: 'hello vue',
        },
        methods: {
            add: function () {
                console.log('我是原生的方法');
            }
        },
        extends: bbb
    });
</script>
~~~
同樣是擴展的先執行,同名支持構造器里面的方法,覆蓋

擴展只能放個對象,不能放數組
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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