在按钮中加文字HTML5,JS中怎么实现鼠标悬停在按钮上显示文字

!doctype htmlhtml lang=enhead meta charset=UTF-8 titleDocument/title/headbodyinput placeholder=请输入时间 id=inpbutton οnclick=go()start/buttonbutton οnclick=stop()stop/buttonbutton id=jixu οnclick=jixu() style=display: none;continue/buttondiv id=result/divscript var time, div=document.getElementById('result'), stopState = false; function go(){ time = document.getElementById('inp').value; timeout(); } function timeout(){ if(time ==''){ alert('请输入时间') return; } setTimeout(function(){ time--; div.innerText = time; if(time!==0 && !stopState){ timeout(); } },1000); } function jixu(){ time = Number(document.getElementById('result').innerText); document.getElementById('jixu').style.display = 'none'; stopState =false; timeout(); } function stop(){ document.getElementById('jixu').style.display = ''; stopState = true; }/script/body/html

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