范圍可能是例如5到10，這是我到目前為止所做的，但仍然沒有達到我想要的<script>function checkpattern(elem){    var textbox = document.getElementById("textbox");    if(textbox.value.length<=10 && textbox.value.length>=5)    {        alert("5 to 10");    }    else    {        if(!elem.value.match('^'+elem.getAttribute('pattern')+'$'))        {            alert('Accepts digits only');        }    }}</script><input type = "text" name = "amt" maxlength = "10" pattern = [0-9] onchange = checkpattern(this) placeholder="Enter Amount" onfocus="this.placeholder = ''" onblur="this.placeholder = 'Enter Amount '" required="">