JavaScript Action text box readonly_ form effects

I got a question about the text box ReadOnly property this morning.

Specifically: Use JavaScript to modify this property.

Just start in the JavaScript is dead or alive can not get the value of this property, no way, to search the Internet. Not carefully, it is felt that I wrote with them no difference ah, I do not believe, but also do not make it? But it's just not good:(

Finally, a careful look at one of the online, found that there is a problem, I do not capitalize, the writing is all lowercase letters.

ReadOnly <====> readonly

After change to the latter, really good:

It seems to be or experience not ah, the most important, learning or be serious, attitude determines whether you can learn something ....