在jQuery中进行轮询是否昂贵，还有替代方案吗？

Question

I have several users accessing my page at the same time, with each client polling (using setInverval) another php script that reads a value from a database and prints it.

setInterval( "printData();", 300 );

I'm relatively new to jQuery and javascript, and I'm a bit skeptical of the viability of constantly running this php script and constantly making database queries.

Can someone calm my nerves or provide an alternative to my current method?

Answer 1

You are updating it every 0.3 seconds - that's over 3 times a second. Way too much. Depending on how smooth it needs to be, update it at most every 5 seconds (5000) instead.

Also, just to make it a little faster, just drop the quotes and parentheses:

setInterval(printData,5000);