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                            原生js
~~~
// 返回頂部
if ( $("#returnTop").length ) {

    var _obj = document.getElementById("contents");
    var btn = document.getElementById("returnTop");
    var now = _obj.scrollTop;
    btn.onclick = function() {
        var timer = setInterval(function() {
            now = _obj.scrollTop;
            //滾動條豎直距離
            speed = (0 - now) / 10;
            speed = Math.floor(speed);
            if (now == 0) {
                clearInterval(timer);
            } else {
                _objscrollTop = now + speed; //標準模式下的瀏覽器
                _obj.scrollTop = now + speed; //怪異模式下的瀏覽器

            }

        }, 10);
    }


}
~~~

jquery
~~~
// totop
$('[scroll="top"]').on("click",function(){

    $("body,html").animate({scrollTop:0});

});
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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