iPhone Javascript execution time

In the Apple docs it says that

JavaScript exec开发者_开发技巧ution time is limited to 10 seconds for each top-level entry point. If your script executes for more than 10 seconds, Safari on iPhone OS stops executing the script at a random place

I plan to have some Javascript run every 10 seconds or so that will do an AJAX query to the server and rewrite just the section of the page necessary. Will this be possible with these restrictions on the device?

Yes, it is possible, provided that you implement it using a callback that is invoked every 10 seconds, rather than busy waiting for 10 seconds. In other words, if you use setInterval to achieve this, then you're fine.