好的，我自己也经常希望有这样的功能，但从未真正下定决心去做些什么。既然你现在提出了要求，我就坐下来，修改了jQuery UI的滑块，按照你的要求添加了填充选项。
注意：我只为具有单个手柄的水平滑块添加了该选项。其他情况并不更加复杂。我只是没有动力去输入和测试可能目前并不需要的案例。
在您包含了jQuery UI中原始滑块后，请包含此代码扩展。该扩展程序将覆盖几种方法，并向Slider小部件添加“paddingMin”和“paddingMax”选项（值必须为数字，并将被解释为像素；显然，这也可以轻松地扩展以采用其他单位，但这又意味着要对目前未请求的案例进行更多的输入/测试）。
简单的使用示例如下：
$('#slider').slider({ paddingMin: 50, paddingMax: 100 });
扩展黑客代码（按原样提供，不要起诉我）：
(
function($, undefined)
{
$.ui.slider.prototype.options =
$.extend(
{},
$.ui.slider.prototype.options,
{
paddingMin: 0,
paddingMax: 0
}
);
$.ui.slider.prototype._refreshValue =
function() {
var
oRange = this.options.range,
o = this.options,
self = this,
animate = ( !this._animateOff ) ? o.animate : false,
valPercent,
_set = {},
elementWidth,
elementHeight,
paddingMinPercent,
paddingMaxPercent,
paddedBarPercent,
lastValPercent,
value,
valueMin,
valueMax;
if (self.orientation === "horizontal")
{
elementWidth = this.element.outerWidth();
paddingMinPercent = o.paddingMin * 100 / elementWidth;
paddedBarPercent = ( elementWidth - ( o.paddingMin + o.paddingMax) ) * 100 / elementWidth;
}
else
{
elementHeight = this.element.outerHeight();
paddingMinPercent = o.paddingMin * 100 / elementHeight;
paddedBarPercent = ( elementHeight - ( o.paddingMin + o.paddingMax) ) * 100 / elementHeight;
}
if ( this.options.values && this.options.values.length ) {
this.handles.each(function( i, j ) {
valPercent =
( ( self.values(i) - self._valueMin() ) / ( self._valueMax() - self._valueMin() ) * 100 )
* paddedBarPercent / 100 + paddingMinPercent;
_set[ self.orientation === "horizontal" ? "left" : "bottom" ] = valPercent + "%";
$( this ).stop( 1, 1 )[ animate ? "animate" : "css" ]( _set, o.animate );
if ( self.options.range === true ) {
if ( self.orientation === "horizontal" ) {
if ( i === 0 ) {
self.range.stop( 1, 1 )[ animate ? "animate" : "css" ]( { left: valPercent + "%" }, o.animate );
}
if ( i === 1 ) {
self.range[ animate ? "animate" : "css" ]( { width: ( valPercent - lastValPercent ) + "%" }, { queue: false, duration: o.animate } );
}
} else {
if ( i === 0 ) {
self.range.stop( 1, 1 )[ animate ? "animate" : "css" ]( { bottom: ( valPercent ) + "%" }, o.animate );
}
if ( i === 1 ) {
self.range[ animate ? "animate" : "css" ]( { height: ( valPercent - lastValPercent ) + "%" }, { queue: false, duration: o.animate } );
}
}
}
lastValPercent = valPercent;
});
} else {
value = this.value();
valueMin = this._valueMin();
valueMax = this._valueMax();
valPercent =
( ( valueMax !== valueMin )
? ( value - valueMin ) / ( valueMax - valueMin ) * 100
: 0 )
* paddedBarPercent / 100 + paddingMinPercent;
_set[ self.orientation === "horizontal" ? "left" : "bottom" ] = valPercent + "%";
this.handle.stop( 1, 1 )[ animate ? "animate" : "css" ]( _set, o.animate );
if ( oRange === "min" && this.orientation === "horizontal" ) {
this.range.stop( 1, 1 )[ animate ? "animate" : "css" ]( { width: valPercent + "%" }, o.animate );
}
if ( oRange === "max" && this.orientation === "horizontal" ) {
this.range[ animate ? "animate" : "css" ]( { width: ( 100 - valPercent ) + "%" }, { queue: false, duration: o.animate } );
}
if ( oRange === "min" && this.orientation === "vertical" ) {
this.range.stop( 1, 1 )[ animate ? "animate" : "css" ]( { height: valPercent + "%" }, o.animate );
}
if ( oRange === "max" && this.orientation === "vertical" ) {
this.range[ animate ? "animate" : "css" ]( { height: ( 100 - valPercent ) + "%" }, { queue: false, duration: o.animate } );
}
}
};
$.ui.slider.prototype._normValueFromMouse =
function( position ) {
var
o = this.options,
pixelTotal,
pixelMouse,
percentMouse,
valueTotal,
valueMouse;
if ( this.orientation === "horizontal" ) {
pixelTotal = this.elementSize.width - (o.paddingMin + o.paddingMax);
pixelMouse = position.x - this.elementOffset.left - o.paddingMin - ( this._clickOffset ? this._clickOffset.left : 0 );
} else {
pixelTotal = this.elementSize.height - (o.paddingMin + o.paddingMax);
pixelMouse = position.y - this.elementOffset.top - o.paddingMin - ( this._clickOffset ? this._clickOffset.top : 0 );
}
percentMouse = ( pixelMouse / pixelTotal );
if ( percentMouse > 1 ) {
percentMouse = 1;
}
if ( percentMouse < 0 ) {
percentMouse = 0;
}
if ( this.orientation === "vertical" ) {
percentMouse = 1 - percentMouse;
}
valueTotal = this._valueMax() - this._valueMin();
valueMouse = this._valueMin() + percentMouse * valueTotal;
return this._trimAlignValue( valueMouse );
};
}
)(jQuery);
