js滚动到指定元素

<style>button{ ???position: fixed; ???bottom: 0; ???right: 0;}</style><button id="button">click to see</button><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>2</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>3</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><a id="ele" href="#">see me</a><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>3</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>1</p><p>4</p><p>1</p><p>1</p><script>var button = document.getElementsByTagName(‘button‘)[0]button.onclick = function(){ ???clickToSee(‘ele‘) ??}function clickToSee(id,time = 1){ ???var c_top = document.body.scrollTop ???var ele = document.getElementById(id) ???var e_top = ele.offsetTop ???var diff = e_top - c_top ???var step = diff/100 ???time = time/100*1000 ???var o_flag ???if(diff>0){ ???????o_flag = true ???}else{ ???????o_flag = false ???} ???var timer = setInterval(function(){ ???????var c_flag ???????diff -= step ???????window.scrollBy(0,step) ???????if(diff>0){ ???????????c_flag = true ???????}else{ ???????????c_flag = false ???????} ???????if(!o_flag === c_flag){ ???????????clearInterval(timer) ???????} ???????console.log(diff) ???},time)}</script>