文本框中只能输入小于等于100的正整数

<input id="discount" maxlength='3'onkeyup="myFunction(this.value)" />function myFunction(nubmer) { if (isNaN(nubmer) || nubmer <= 0 || nubmer >= 101 || !(/^\d+$/.test(nubmer))) {{ $.messager.alert('提示','请输入正确的数值,只允许输入小于等于100的正整数!');document.getElementById("discount").value = "";return false;}}}