<div class="progress">
   <div class="progress_bg">
    <div class="progress_bar"></div>
   </div>
   <div class="progress_btn"></div>
   <div class="text">0%</div>
  </div>

　 .progress{position: relative; width:300px;margin:100px auto;}
  .progress_bg{height: 10px; border: 1px solid #ddd; border-radius: 5px; overflow: hidden;background-color:#f2f2f2;}
  .progress_bar{background: #5FB878; width: 0; height: 10px; border-radius: 5px;}
  .progress_btn{width: 20px; height: 20px; border-radius: 5px; position: absolute;background:#fff; 
  left: 0px; margin-left: -10px; top:-5px; cursor: pointer;border:1px #ddd solid;box-sizing:border-box;}
  .progress_btn:hover{border-color:#F7B824;}

$(function(){
    var tag = false,ox = 0,left = 0,bgleft = 0;
    $('.progress_btn').mousedown(function(e) {
     ox = e.pageX - left;
     tag = true;
    });
    $(document).mouseup(function() {
     tag = false;
    });
    $('.progress').mousemove(function(e) {//鼠標(biāo)移動(dòng)
     if (tag) {
      left = e.pageX - ox;
      if (left <= 0) {
       left = 0;
      }else if (left > 300) {
       left = 300;
      }
      $('.progress_btn').css('left', left);
      $('.progress_bar').width(left);
      $('.text').html(parseInt((left/300)*100) + '%');
     }
    });
    $('.progress_bg').click(function(e) {//鼠標(biāo)點(diǎn)擊
     if (!tag) {
      bgleft = $('.progress_bg').offset().left;
      left = e.pageX - bgleft;
      if (left <= 0) {
       left = 0;
      }else if (left > 300) {
       left = 300;
      }
      $('.progress_btn').css('left', left);
      $('.progress_bar').animate({width:left},300);
      $('.text').html(parseInt((left/300)*100) + '%');
     }
    });
   });