要定义一个变量,接收setInterval返回的值
在需要的时候把变量传给clearInterval
var intval = setInterval(function(){}, 1000);
clearInterval(intval)
var intervalId = setInterval(w, 2000);
ul.onclick = function() {
clearInterval(intervalId);
console.log(11);
}
window.clearInterval(setInterval(right.onclick, 2000));