<!DOCTYPE html>

<html>

    <head>

        <meta charset="UTF-8">

        <title></title>

        <script type="text/javascript" src="js/jquery-3.1.1.min.js" ></script>

        <script>

            function check(){

                var str='23';

                var num=23;

                console.log(str==num);

                console.log(str!=num);

                console.log(str===num);

                console.log(str!==num);

            }

        </script>

    </head>

    <body>

        <button onclick="check();">点击我</button>

    </body>

</html>