Wait online, urgent, how to judge the linkage problem of select

how does js implement when the first select selects 2, the first optionvalue of the second select becomes 2, automatically Filter disables value=1 "s option?
online, etc., urgent

< hr > 
    <select id="s1" onchange="bb()">
        <option value="1">1</option>
        <option value="2">2</option>
        <option value="3">3</option>
        <option value="4">4</option>
        <option value="5">5</option>
        <option value="6">6</option>
        <option value="7">7</option>
    </select>

    <select id="s2">
        <option value="1">1</option>
        <option value="2">2</option>
        <option value="3">3</option>
        <option value="4">4</option>
        <option value="5">5</option>
        <option value="6">6</option>
        <option value="7">7</option>
    </select>

    <script type="text/javascript">

        var s1Val=$("-sharps1 option:selected");
        var s2Val=$("-sharps2 option:selected");

        function bb(){
            console.log(s1Val.val());
        }

    </script>
Javascript
Apr.01,2021

use the change event to get the subscript of the first $("- sharps1 option:selected"), then subtract 1 from this subscript, and delete the corresponding option of the second drop-down menu

. 
<select id="s1" onchange="bb(this)">
    <option value="1">1</option>
    <option value="2">2</option>
    <option value="3">3</option>
    <option value="4">4</option>
    <option value="5">5</option>
    <option value="6">6</option>
    <option value="7">7</option>
</select>

<select id="s2">
    <option value="1">1</option>
    <option value="2">2</option>
    <option value="3">3</option>
    <option value="4">4</option>
    <option value="5">5</option>
    <option value="6">6</option>
    <option value="7">7</option>
</select>
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
<script type="text/javascript">
    function bb(_this) {
        //$("-sharps2 option[value='" + $(_this).val() + "']").attr("selected", "selected");
        $("-sharps2").children("option").each(function () {
            var temp_value = $(this).val();
            if (temp_value <= $(_this).val()) {
                $(this).attr("disabled", "disabled");
            }
        });
    }
</script>

I don't know if it's what the landlord wants.

I think so. I guess! 

<script type="text/javascript">
    function bb(_this) {
        $("-sharps2 option[value='" + $(_this).val() + "']").attr("selected", "selected");
        $("-sharps2").children("option").each(function () {
            var temp_value = $(this).val();
            if (temp_value < $(_this).val()) {
                $(this).hide();
            } else {
                $(this).show();
            }
        });
    }
</script>

var s1Value $("- sharps1 option:selected") val ();
var s2Va = s1Val==2? $('- sharps2'). Val (2): $('- sharps2'). Val ($("- sharps2 option:selected") val ())

)

Previous: In the react project, different contents are displayed on the right according to the elements clicked on the left.

Next: How to control the switch of tabs with buttons

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e6930e-45cfb.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e6930e-45cfb.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?