为什么输入类型为“number"的html允许在字段中输入字母“e"? [英] Why does the html input with type "number" allow the letter 'e' to be entered in the field?

问题描述

我有以下 html5 输入元素:

I have the following html5 input element:

<input type="number">

为什么此输入允许在输入字段中输入字符e"?无法输入其他字母字符(如预期)

Why does this input allow for the character 'e' to be entered in the input field? No other alphabet character is able to be entered (as expected)

使用 chrome v. 44.0.2403.107

Using chrome v. 44.0.2403.107

下面的例子看看我的意思.

Example below to see what I mean.

<input type="number">

推荐答案

因为这正是 规范 说它应该可以工作.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):

Because that's exactly how the spec says it should work. The number input can accept floating-point numbers, including negative symbols and the e or E character (where the exponent is the number after the e or E):

一个浮点数由以下部分组成，准确地以下顺序:

A floating-point number consists of the following parts, in exactly the following order:

1. 可选地，第一个字符可以是-"字符.
2. 0—9"范围内的一个或多个字符.
3. (可选)以下部分，完全按照以下顺序:

1. Optionally, the first character may be a "-" character.
2. One or more characters in the range "0—9".
3. Optionally, the following parts, in exactly the following order:

1. 一个."字符
2. 0—9"范围内的一个或多个字符

1. a "." character
2. one or more characters in the range "0—9"

(可选)以下部分，完全按照以下顺序:

Optionally, the following parts, in exactly the following order:

1. 一个e"字符或E"字符
2. 可选，-"字符或+"字符
3. 0—9"范围内的一个或多个字符.

1. a "e" character or "E" character
2. optionally, a "-" character or "+" character
3. One or more characters in the range "0—9".

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