1、setInterval都會(huì)先預(yù)執(zhí)行一遍，才會(huì)去全部執(zhí)行一遍？2、<!DOCTYPE html><html><head><meta charset="UTF-8"> <title></title> <script>
window.onload = function(){
var bu = document.getElementsByTagName("button")[0];
bu.onclick = function(){
setInterval(
function(){
alert("aaa")
var AA = document.getElementById("aa");
var BB = document.getElementById("bb").firstChild;
AA.appendChild(BB); }
,3000); } } </script></head><body><ul id="aa"><li>1</li> <li class="cc">樓下的上來</li></ul><ul id="bb"><li>2</li> <li>樓上的給我下來別上去</li></ul><button>點(diǎn)擊</button></body></html>
setInterval都會(huì)先預(yù)執(zhí)行一遍，才會(huì)去全部執(zhí)行一遍
慕田峪4524236
2018-09-03 13:45:56