用jquery来实现类似“网易新闻”横向标题滑动的移动端页面

HTML:

<div id="navbar">
                <div id='navbar_content' style="left:0px;">
                    <div class="channel active">
                        <span>shouye</span>
                    </div>
                    <div class="channel">
                        <span>shouyeshouye</span>
                    </div>
                    <div class="channel">
                        <span>shouyeshouyeshouyeshouyes</span>
                    </div>
                    <div class="channel">
                        <span>shouye</span>
                    </div>
                    <div class="channel">
                        <span>shouye</span>
                    </div>
                    <div class="channel">
                        <span>shouye</span>
                    </div>
                    <div class="channel">
                        <span>shouye</span>
                    </div>
                    <div class="channel">
                        <span>shouye</span>
                    </div>
                    <div class="channel">
                        <span>shouye</span>
                    </div>
                </div>
            </div>
        </div>

CSS:

#navbar{
    background: rgba(247,247,247,0.95);
    overflow: hidden;
    position: relative;
    text-align: center;
    font-size: 1em;
    padding-left: 5px;
    line-height: 28px;
}
#navbar_content{
    font-size: 1em;
    text-align: left;
    white-space: nowrap;
    position: relative;
}
.channel{
    vertical-align: top;
    display: inline-block;
    padding: 0 5px;
    color: rgba(0,0,0,0.6);
    font-weight: normal;
    line-height: 26px;
    border-bottom: 2px solid transparent;
}
.channel.active {
    color: #1c88cd;
    border-color: #1c88cd;
}

JS:

 $(function(){
        console.log($('#navbar').width())
        var total_width=0;
        var div_arr=$('.channel');
        for(var i=0,len=div_arr.length;i<len;i++){
            total_width+=div_arr[i].offsetWidth;
        }
        console.log(total_width);

    var x,old_left;
    $('#navbar_content')
        .live('touchstart', function(e) {
            console.log(e.originalEvent.pageX)
            x = e.originalEvent.targetTouches[0].pageX // anchor point
            old_left = parseInt(e.currentTarget.style.left);
        })
        .live('touchmove', function(e) {
            var change = e.originalEvent.targetTouches[0].pageX - x;
            e.currentTarget.style.left = (old_left+change)+"px";
        })
        .live('touchend', function(e) {
            var left = parseInt(e.currentTarget.style.left);
            var new_left;
            var window_width=document.body.scrollWidth;
            if (left < parseInt("-"+total_width)+$('#navbar').width()+100) {
                new_left = "-"+(total_width-$('#navbar').width()+100);
            }else if (left > 0) {
                new_left = '0'
            }
            $(e.currentTarget).animate({left: new_left}, 500);
            e.currentTarget.style.left = new_left;

        });

    });