简单回到顶部代码

    <div id="hqestop"></div>
    <div class="backtop">
    <!-- onfocus="this.blur();去掉点击a标签时的虚线 -->
    <a href="#hqestop" target="_self" onfocus="this.blur();">
    <button class="btnbacktop" type="回到顶部" onfocus="this.blur();">
        <i class="fa fa-caret-up"></i>
    </button>
    </a>
    </div>
    
    <script>
	$(document).ready(function(){  
	    $(".backtop").hide();  
	    $(function () {  
	        //检测屏幕高度  
	        var height=$(window).height();  
	        //scroll() 方法为滚动事件  
	        $(window).scroll(function(){  
	            if ($(window).scrollTop()>height){  
	                $(".backtop").fadeIn(500);  
	            }else{  
	                $(".backtop").fadeOut(500);  
	                }  
	        });  
	        $(".backtop").click(function(){  
	            $('body,html').animate({scrollTop:0},100);  
	            return false;  
	        });  
	    });  
	});  
   </script>