<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>数组监听</title>
</head>
<body>
    <div id="app">
        {{array}}
    </div>

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

    <script>
        let vm = new Vue({
            el:'#app',
            data:{
                array:[-1,0,1,2]
            },
            watch:{
               array(newValue){
                   console.log(`array变化为${newValue}`);
               }
            }
        });

        vm.array = vm.array.filter(_=>_ > 0);
    </script>
</body>
</html>