输入文本元素的正确只读属性语法是什么? [英] What is the correct readonly attribute syntax for input text elements?

问题描述

和大多数人一样，我熟悉 text input 的 readonly 属性，但是在阅读其他网站的代码时(我的一个坏习惯)，我看到了不止一个此属性的实现:

As Most, I am familiar with the readonly attribute for text input, But while reading code from other websites (a nasty habit of mine ) I saw more than one implementation for this attribute:

<input type="text" value="myvalue" class="class anotherclass" readonly >

和

<input type="text" value="myvalue" class="class anotherclass" readonly="readonly" >

我什至见过

<input type="text" value="myvalue" class="class anotherclass" readonly="true" >

.. 我相信我看到了更多，但现在想不起来确切的语法了..

.. And I believe I saw even more, but can not recall the exact syntax now..

那么，我应该使用哪一个是正确的?

So, which one is the correct one that I should use?

推荐答案

来自 w3:

readonly = "readonly" 或 ""(空字符串) 或 empty -指定该元素表示其值不可编辑的控件.

readonly = "readonly" or "" (empty string) or empty - Specifies that element represents a control whose value is not meant to be edited.

所以基本上是一样的.

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