I have this field
In IE9 the following line gives me the error 'SCRIPT601: Unknown runtime error ' //option 1. document.getElementById('code').innerHTML = 'some text';
The error disappears and it seems to work (assiging empty value) when I change the line to: //option 2. document.getElementById('code').innerHTML = '';
The I tried this: //option 3. document.getElementById('code').innerHTML = escape('some text');
but then the HTML gets to be escaped and thats not what I want, I want this exact string to be placed in the textbox.
In Chrome and Firefox the code in option 1 does run correctly.
What can I do to fix this?
You should set the value property.
At a guess, does your webpage have a <!DOCTYPE html> or similar?
http://blogs.msdn.com/b/ie/archive/2011/03/24/ie9-s-document-modes-and-javascript.aspx
In IE9 quirks mode accepted solution won't work.
As you are probably trying to set innerHtml for <p>, it will work if you replace <p> with <div>.
Credits: Theo Gray, http://www.theogray.com/blog/2009/06/internet-explorer-unknown-runtime-error
来源：https://stackoverflow.com/questions/5503806/ie9-set-innerhtml-of-textarea-with-html-tags