div 3秒后自动滚屏

div 3秒自动滚屏 

//proDetail div的id
//3秒滚动一次
setTimeout("changeHight()",3000);
function changeHight(){//滚动之前的高度var beforeHeight = $("#proDetail").scrollTop();$("#proDetail").scrollTop(beforeHeight+145);//滚动之前的高度var afterHeight = $("#proDetail").scrollTop();//如果之前和之后的相等了，说明到了底部了，然后重新滚动if(beforeHeight == afterHeight){$("#proDetail").scrollTop(0);}setTimeout("changeHight()",3000);
}