Question

javascript 怎样实现点击后回到顶部

Answer 1

body中写个div
<div class="scroll" id="scroll" style="display:none;"></div>

<script type="text/javascript">
$(function(){
showScroll();
function showScroll(){
$(window).scroll( function() {
var scrollValue=$(window).scrollTop();
scrollValue > 100 ? $('div[class=scroll]').fadeIn():$('div[class=scroll]').fadeOut();
} );
$('#scroll').click(function(){
$("html,body").animate({scrollTop:0},200);
});
}
})
</script>