consoledemo.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    
</head>
<body>


    <button onclick="test()">xiaoshan.bug</button>
    
    <script>
        var arr = [ ];
        // ...
        function test() {
            console.log(arr);
            console.log(arr[0]);


            //...
            arr.push({name: '张三', age: 30})

        }


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