Jquery实现可拖动进度条

html

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

css

　　　　 .progress{position: relative; 300px;margin:100px auto;}
        .progress_bg{height: 10px; border: 1px solid #ddd; border-radius: 5px; overflow: hidden;background-color:#f2f2f2;}
        .progress_bar{background: #5FB878;  0; height: 10px; border-radius: 5px;}
        .progress_btn{ 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;}

js

　　　　$(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) {//鼠标移动
                    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) {//鼠标点击
                    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({left},300);
                        $('.text').html(parseInt((left/300)*100) + '%');
                    }
                });
            });