After the external css style is changed, refresh IE and there is no change? _html/css_WEB-ITnose

I used IETester to test CSS. I used an external one.css file, updated the styles in it and saved it.
Then refreshed IETester to see the results, and found that the one.css file did not reflect the changes
(It’s the same with IE), it’s still the original style.
What is the reason for this and how to solve it?

Reply to discussion (solution)

There is caching, add time after the style, one.css?t=201409301708

Same as upstairs. It should be cache