范围滑块:jQuery 更改值，但滑块不移动

我运行以下程序：

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title> Slider </title>
<!-- jQuery CDN https://code.jquery.com/ -->
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script> 
<script type="text/javascript"src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
<script>
$(document).ready(function() {
console.debug("jQuery "+ (jQuery ? $().jquery : "NOT") +" loaded"); // jQuery version to console
$('#slider1').slider({value: "11"});                                // initialize slider
$("#slider1").slider("option", "value", 2);       
$("#slider1" ).slider("value", 3 );
var value = $( "#slider1" ).slider( "option", "value");    // show slider value 
$('#sliderVal').text("Slider Value: "+value);
$('#slider1').on('input', function(event) {                     // show slider value when changed
var valSlider1 =  $(this).attr('id') +"   Value:" +$(this).val();
$('#sliderVal').text(valSlider1);
});
});
</script>
</head>
<body>
<p> Slider </p> 
<input type="range" class="sl" id="slider1"  min="0" max="100" value="99">  
<p id="sliderVal">...</p                     //display value of slider
</body>
</html>

运行程序后，滑块的"拇指"仍然站在 99 上输出(id=sliderVal;倒数第二行(说：滑块值：3
我试过

了

$('#slider1').slider({value: "11"});       
$("#slider1").slider("option", "value", 2);       
$("#slider1" ).slider("value", 3 );

它们都会更改滑块的值，但滑块拇指永远不会移动。当我用鼠标移动滑块的拇指时，会显示正确的值

像这样更改val()$("#slider1").val(2);

$(document).ready(function() {
$("#slider1").val(11);
var value = $("#slider1").val();
$('#sliderVal').text("Slider Value: " + value);
$('#slider1').on('input', function(event) { 
var valSlider1 = $(this).attr('id') + "   Value:" + $(this).val();
$('#sliderVal').text(valSlider1);
});
});
$('#change').click(function() {
$("#slider1").val(2);
$('#sliderVal').text("Slider Value: 2");
});

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script type="text/javascript" src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
<p> Slider </p>
<input type="range" class="sl" id="slider1" min="0" max="100" value="99">
<p id="sliderVal">
</p>
<button id="change">Change</button>

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