JavaScript toString、String和stringify方法区别

<!DOCTYPE html>

<html>

    <head>

        <meta charset="utf-8" />

        <title>JavaScript toString与String方法区别</title>

    </head>

    <body>

        <script type="text/javascript">

            //一 toString限制

            // 报错Cannot read property 'toString' of undefined

            // console.log(undefined.toString())

            // 报错Cannot read property 'toString' of undefined

            //console.log(null.toString())

            //二 String无限制

            console.log(String(undefined))

            console.log(String(null))

            //三 toString可根据进制编码

            let num = 10;

            console.log(num.toString(2))

        </script>

    </body>

</html>

二、stringify也可以实现字符串化，并且健壮性也良好。

<!DOCTYPE html>

<html>

    <head>

        <meta charset="utf-8" />

        <title>JavaScript toString、String和stringify方法区别</title>

    </head>

    <body>

        <script type="text/javascript">

            let a = {

                age: undefined,

                name: null

            }

            //输出 {"name":null}

            console.log(JSON.stringify(a))

            let b;

            //输出 undefined

            console.log(JSON.stringify(b));

            let c = null;

            //输出 null

            console.log(JSON.stringify(c))

        </script>

    </body>

</html>

巴特西

JavaScript toString、String和stringify方法区别

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