now there is a requirement that "date:" is displayed by default in the drop-down box. As shown in the figure: 
now there is a requirement that "date:" is displayed by default in the drop-down box. As shown in the figure:
but I don't know if I'm contradicting myself. Since it is not optional, it should not be displayed by default
add a disabled attribute to the date option. If you are worried that there is no other choice, you can use js to determine that
can be achieved. Use this property in the drop-down menu: disabled= "item.disabled"
URL: http://element.eleme.io/-sharp/zh-.
2</option>
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