as shown in the following figure, when the user does not enter, the input box can use the keyboard to move the number left and right, and then automatically skip the year, month, day and other keywords to enter into the next input area, and if the user"s input value is not a legal date input, there will be no change in the input box.
Picture description
regularly judge whether the value conforms to the standard in the input event
use input.selectionStart , input.selectionEnd Control the cursor
to achieve this effect
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