<! DOCTYPEHtml> <Html> <Headlang="EN" > <Metacharset="UTF-8" > <title></Title> <Style>* {Margin0;Padding0}
p {Width400pxFont-size:30pxHeight300pxBackgroundBlueBorderSolid5Px}
.Top {PositionFixedRight0;Top300Px}
.Tiao {PositionFixedRight0;Top400Px}
.Stop {PositionFixedRight300pxTop500Px} </Style> </Head> <Body> <Divclass="Stop" > <InputType="Button"Value="Star"onclick="T ()"/> <InputType="Text"Id="Shijian"/> <InputType="Button"Value="Stop"onclick="Stop ()"/> </Div> <Div> <InputType="Button"Value="Back to Top"onclick="Fanhu ()"class="Top"/> <InputType="Button"Value=Jumponclick="Tiao ()"class="Tiao"/>
<P>1 Building </P>
<P>2 Building </P>
<P>3 Building </P>
<P>4 Building </P>
<P>5 Building </P>
<P>6 Building </P>
<P>7 Building </P>
<P>8 Building </P>
<P>9 Building </P>
<P>10 Building </P>
<P>11 Building </P>
<P>12 Building </P>
<P>13 Building </P>
<P>14 Building </P>
<P>15 Building </P>
<P>16 Building </P>
</Div> </Body> <ScriptType="Text/javascript" >functionFanhu () {Window.ScrollTo (0,0)}functionTiao () {Window.Scrollby (0,310)}
functionT () {SetInterval ("Star()",100); }
VarI=21;functionStar () {I=I-1;Ifi>=0&&i<=20) {document. getelementbyid ( "Shijian"). value=else{clearinterval ( "Shijian")} } function stop () {i=-1 </script> </HTML>
How to use JS to return to the top and jump to the desired position and timer