js定时器实例分享

setInterval(fn,1000)//正确setInterval(fn(),1000)//错误

window.onload = function() { var timer = null; var num = 0; var i = 0;  var arr=['red','#FF9D0C','#DBFF0D','#3BFF0D','#0DFFA2','#0DE8FF','#0D52FF','#210DFF','#930DFF','#FF0DB4'] var start = document.getElementById('start'); var stop = document.getElementById('stop'); var prizeDraw = document.getElementById('prizeDraw'); start.onclick = function() { clearInterval(timer); timer = setInterval(function(){   num = Math.floor(Math.random()*100+1);  prizeDraw.style.backgroundColor = arr[i];  i++;  if (i==9) {  i = 0;  };  prizeDraw.innerHTML = num; },100); } stop.onclick = function() { clearInterval(timer); }}

#prizeDraw {  width: 100px;  height: 100px;  background: rgba(255,68,253,0.5);  font-size: 30px;  text-align: center;  line-height: 100px;  }

<div id="prizeDraw"></div> <input type="button" value="开始" id="start"> <input type="button" value="暂停" id="stop">