<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>数组元素中是对象的监听</title>
</head>
<body>
    <div id="app">
        {{array}}
    </div>

    <script src="../js/vue.js"></script>

    <script>
        let vm = new Vue({
            el:'#app',
            data:{
                array:[0,1,2,{x:3}]
            },
            watch:{
                array: function (value) {
                    console.log(value[2],value[3].x);
                }
            }
        });

        vm.array[2] = 55;
        vm.array[3].x = 10;
        vm.array.length = 10;
        //以上三种情况均无法监听到

    </script>
</body>
</html>