try,catch捕获错误的用法

2023-01-05 15:49:04

<!DOCTYPE html>

<html>

<head>

    <meta charset="utf-8"/>

    <script>

        var txt="";

        function message(aa)

        {

            try

            {

                txt = JSON.parse(aa)

            }

            catch(err)

            {

                txt="本页有一个错误。\n\n";

                txt+="错误描述：" + err.message + "\n\n";

                txt+="点击确定继续。\n\n";

                alert(txt);

            }

            return txt;

        }

    </script>

</head>

<body>

<input type="button" value="查看消息" onclick="message()" />

</body>

</html>

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