验证文本框只接受小整数

Question

如何验证文本框只接受小整数 (32767) ？

Answer 1

You can use the built-in features of HTML:

 <input type="number" max="32767" />

On submit, the browser will stop the submission and provide an accurate message to the user.

Answer 2

you must use use regular expression.

demo

<script>
    function clean(e) {
        var textfield = document.getElementById(e);
        var regex = /[a-z]/gi;
        textfield.value = textfield.value.replace(regex, "");

    }
</script>
<textarea id="ta" name="ta" onkeyup="clean('ta')" onkeydown="clean('ta')"></textarea>

now what will this do is that it will replace all other character such as alphabet or other symbol and it will only allow to write number and if someone will try to write alphabet or other character then it will remove them

you should do some research of your own. this website should be the last option to get your answer