An introduction to the difference between jQuery's assignment to val and atrr('value')_jquery

When I was working on a project, the data I passed from the background was assigned to a text box through the Google browser

When I made the modification, I found that there was no modification. Finally, I checked the reason. It turned out to be the difference between val and atrr("value" in jQuery on the browser,

So the summary is as follows:
The use of val() and atrr('value' in jquery, assuming there is a default value, if the value is assigned using val(), then when the value is modified, Google cannot obtain the latest value, but ie Yes,
If there is a default value for atrr('value', then when the value is changed, both IE and Google can get the latest changes. Currently, there are no tests on IE and Google, and there is no test on other browsers. Haha