Html 输入文本元素的正确只读属性语法是什么？

What is the correct readonly attribute syntax for input text elements?

提问by Obmerk Kronen

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

与大多数人一样，我熟悉readonlyfor的属性text input，但是在阅读其他网站的代码时（我的一个坏习惯），我看到了此属性的多个实现：

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

and

和

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

and I have even seen

我什至见过

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

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

.. 我相信我看到了更多，但现在想不起来确切的语法了..

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

那么，我应该使用哪一种是正确的呢？

回答by Vucko

From w3:

从w3：

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

readonly= "readonly"或""（空字符串）或空- 指定该元素表示其值不打算编辑的控件。

So basically it's the same.

所以基本上是一样的。

回答by billah77

is should be

应该是

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