自己写的jQuery拖动滑块

 (function ($) {
             $.fn.bnSlide = function (options) {
                 var defaults = {
                     colorData: 0, //原始滑道的有效值
                     maxWidth: 10, //整个滑道有效值
                    // Width: 500, //整个容器的宽度
                     //height: 20//整个容器的高度
                 };
                 options = $.extend(defaults, options);
                 if (options.colorData < 0)
                     options.colorData = 0;
                 else if (options.colorData > options.maxWidth)
                     options.colorData = options.maxWidth;

                 var obj = this;
                 var objSlideColor = null; //有效轨道的对象
                 var objBlock = null; //滑块对象
                 var objPathway = null; //滑道对象

                 function print(nowX) {//有效滑道长度colorwidth
                     var nowData = options.maxWidth * nowX / maxPathway;
                     nowData = Math.round(nowData);
                     options.objPrint.val(nowData);
                 }
                 function blockAddress(nowX) {
                     objBlock.css({ "left": nowX + "px" });
                     objSlideColor.width(nowX);
                 }
                 /**
                 加载插件
                 **/
                 (function () {
                     var html = "";
                     html += "<div class='bnSlidePathway'>";
                     html += "<div class='bnSlideColor'></div>";
                     html += "</div>";
                     html += "<div class='bnSlideBlock'></div>";
                     obj.addClass("bnSlide").html(html);
                     objSlideColor = $(".bnSlideColor", obj); //有效轨道的长度
                     objBlock = $(".bnSlideBlock", obj); //滑块对象
                     objPathway = $(".bnSlidePathway", obj);
                 })();                

                 var objOffset = obj.offset();
                 var objLeft = objOffset.left; //滑道的left
                 var objWidth = obj.width(); //滑道长度
                 var objBlockWidth = objBlock.width(); //滑块宽度
                 var maxPathway = objWidth - objBlockWidth; //有效长度
                 var colorWidth = options.colorData * maxPathway / options.maxWidth; //红色轨道的实际长度
                 objSlideColor.width(colorWidth);
                 objBlock.css({ "left": colorWidth });
                 options.objPrint.val(options.colorData);

                 $(document).on("mouseup", function () {
                     $(document).off("mousemove");
                 });

                 options.objPrint.on("blur", function () {
                     var nowData = $(this).val();
                     if (isNaN(nowData)) {
                         $(this).css("background-color", "red"); return;
                     }
                     if (nowData > options.maxWidth || nowData < 0) {
                         $(this).css("background-color", "red"); return;
                     }
                     $(this).css("background-color", "white");
                     var nowX = nowData * maxPathway / options.maxWidth;
                     blockAddress(nowX);
                 });

                 objPathway.on("click", function (event) {
                     var pointX = event.clientX;
                    var maxLeft=maxPathway+objLeft;
                    var nowX=0;
                    if(pointX>=maxLeft) nowX=maxPathway;
                    else nowX = pointX - objLeft;

                     blockAddress(nowX);
                     print(nowX);
                 });

                 objBlock.on("mousedown", function (event) {
                     var pointX = event.clientX; //鼠标坐标x,距浏览器
                     var blockX = $(this).offset().left; //滑块的left
                     var pointInBlockW = pointX - blockX; //鼠标在滑块的横向位置
                     $(document).on("mousemove", function (event) {
                         pointX = event.clientX; //鼠标坐标
                         blockX = objBlock.offset().left; //滑块左坐标
                         var nowX = pointX - pointInBlockW - objLeft; //滑块的新坐标x,相对坐标;鼠标绝对坐标-鼠标在滑块中的位置-最外层left
                         if(pointX>=(objWidth+objLeft)){//如果鼠标超出滑道的最右边,取最大值
                             blockAddress(maxPathway);
                             print(maxPathway);
                         }
                          else if(pointX<=objLeft)//如果鼠标超出滑道最左边,取最小值
                          {
                          blockAddress(0);
                          print(0);
                          }
                         else  if (nowX >= maxPathway) {//如果滑块的当前距离大于等于有效滑道距离,不运动
                              return;
                         }
                         else if (nowX <= 0) {//如果滑块的当前距离小于0,不运动
                              return;
                         }
                         else {
                             blockAddress(nowX);
                             print(nowX);
                         }
                     });
                 })
             }
         })(jQuery);

css部分:

 .bnTest { left: 100px;width: 500px; height: 20px;  }
         .bnSlide { width: 500px; height: 20px; position: relative;}
         .bnSlide .bnSlidePathway { background-color: Black; height: 10px; width: 100%; position: relative; top: 5px;  border-radius:20px;}
         .bnSlide .bnSlidePathway .bnSlideColor { background-color:#52c2ec; width: 100%; height: 100%; border-top-left-radius:20px; border-bottom-left-radius:20px }
         .bnSlide .bnSlideBlock { background-color: Gray; width: 20px; height: 20px; position: absolute; top:; left:; cursor: pointer; border-radius: 5px; }

插件的调用:

  $(function () {
             $(".bnTest").bnSlide({ colorData: 2, objPrint: $(".bnSlideOutPrint") });
         });

HTML部分:

 <input type="text" class="bnSlideOutPrint" />
 <div class="bnTest"></div>

界面效果: