$(function(){
$("#d1").click(function(){
var scroll_offset = $("#skill").offset();
var scroll=scroll_offset.top-200;
$("body,html").animate({
scrollTop:scroll //让body的scrollTop等于pos的top，就实现了滚动
},100);
});
$("#d2").click(function(){
var scroll_offset = $("#practice").offset();
var scroll=scroll_offset.top-200;
$("body,html").animate({
scrollTop:scroll //让body的scrollTop等于pos的top，就实现了滚动
},100);
});
});
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