How to determine whether the input box is empty in jquery

Jquery method to determine whether the input box is empty: first create a front-end code sample file; then pass the statement "$(function () {var t = $("#airline");if (t.val () == "") {t.focus();}})" to realize the judgment.

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jquery determines whether all input boxes are empty

The code is as follows:

$(function () {
var t = $("#airline");
if (t.val() == "") {
t.focus();
}
});

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