提供答案的替代
方法是在输入中监控按键。我个人喜欢将type =“number”作为
属性。这是
一个
JSFiddle
<form action="#" method="post">
Numbers: <input name="num"
type="number"
min="1"
step="1"
onkeypress="return event.charCode >= 48 && event.charCode <= 57"
title="Numbers only">
<input type="submit">
</form>