要隐藏字母e和负号，可以这样做:

onkeydown="return event.keyCode !== 69 && event.keyCode !== 189"

E代表指数，用来缩短长数字。因为输入是数学输入而指数在数学中是用来缩短数字的，所以这里有个E。

显示如下:4e。

链接:1和2

使用angular，你可以限制输入e，+，-， e

 <input type="number"  (keypress)="numericOnly($event)"/>


  numericOnly(event): boolean { // restrict e,+,-,E characters in  input type number
    debugger
    const charCode = (event.which) ? event.which : event.keyCode;
    if (charCode == 101 || charCode == 69 || charCode == 45 || charCode == 43) {
      return false;
    }
    return true;

  }

一个简单的解决方案，排除除整数

<输入 类型=“数字” min=“1” 步骤=“1” onkeypress=“return event.keyCode === 8 ||事件.字符代码 >= 48 &&; 事件.字符代码 <= 57“>

此解决方案不防止复制和粘贴(包括字母“e”)。

上述解决方案只适用于普通html。 对于reactJS，我建议你这样做

  <input type="number" onKeyDown={(e) =>["e", "E", "+", "-"].includes(e.key) && e.preventDefault()} >

因为这正是规范所规定的。数字输入可以接受浮点数，包括负号和e或e字符(其中指数是e或e后面的数字):

A floating-point number consists of the following parts, in exactly the following order: Optionally, the first character may be a "-" character. One or more characters in the range "0—9". Optionally, the following parts, in exactly the following order: a "." character one or more characters in the range "0—9" Optionally, the following parts, in exactly the following order: a "e" character or "E" character optionally, a "-" character or "+" character One or more characters in the range "0—9".