https://www.runoob.com/try/try.php?filename=jqueryui-example-slider-colorpicker
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery UI 滑块（Slider） - 颜色选择器</title>
<link rel="stylesheet" href="//apps.bdimg.com/libs/jqueryui/1.10.4/css/jquery-ui.min.css">
<script src="//apps.bdimg.com/libs/jquery/1.10.2/jquery.min.js"></script>
<script src="//apps.bdimg.com/libs/jqueryui/1.10.4/jquery-ui.min.js"></script>
<link rel="stylesheet" href="jqueryui/style.css">
<style>
#red, #green, #blue {
float: left;
clear: left;
width: 300px;
margin: 15px;
}
#swatch {
width: 120px;
height: 100px;
margin-top: 18px;
margin-left: 350px;
background-image: none;
}
#red .ui-slider-range { background: #ef2929; }
#red .ui-slider-handle { border-color: #ef2929; }
#green .ui-slider-range { background: #8ae234; }
#green .ui-slider-handle { border-color: #8ae234; }
#blue .ui-slider-range { background: #729fcf; }
#blue .ui-slider-handle { border-color: #729fcf; }
</style>
<script>
function hexFromRGB(r, g, b) {
var hex = [
r.toString( 16 ),
g.toString( 16 ),
b.toString( 16 )
];
$.each( hex, function( nr, val ) {
if ( val.length === 1 ) {
hex[ nr ] = "0" + val;
}
});
return hex.join( "" ).toUpperCase();
}
function refreshSwatch() {
var red = $( "#red" ).slider( "value" ),
green = $( "#green" ).slider( "value" ),
blue = $( "#blue" ).slider( "value" ),
hex = hexFromRGB( red, green, blue );
$( "#swatch" ).css( "background-color", "#" + hex );
}
$(function() {
$( "#red, #green, #blue" ).slider({
orientation: "horizontal",
range: "min",
max: 255,
value: 127,
slide: refreshSwatch,
change: refreshSwatch
});
$( "#red" ).slider( "value", 255 );
$( "#green" ).slider( "value", 140 );
$( "#blue" ).slider( "value", 60 );
});
</script>
</head>
<body class="ui-widget-content" style="border:0;">
<p class="ui-state-default ui-corner-all ui-helper-clearfix" style="padding:4px;">
<span class="ui-icon ui-icon-pencil" style="float:left; margin:-2px 5px 0 0;"></span>
简单的颜色选择器
</p>
<div id="red"></div>
<div id="green"></div>
<div id="blue"></div>
<div id="swatch" class="ui-widget-content ui-corner-all"></div>
</body>
</html>