定時(shí)器
定時(shí)器在javascript中的作用
1、制作動(dòng)畫
2、異步操作
3、函數(shù)緩沖與節(jié)流
定時(shí)器類型及語法
/*
定時(shí)器：
setTimeout 只執(zhí)行一次的定時(shí)器
clearTimeout 關(guān)閉只執(zhí)行一次的定時(shí)器
setInterval 反復(fù)執(zhí)行的定時(shí)器
clearInterval 關(guān)閉反復(fù)執(zhí)行的定時(shí)器
/
var time1 = setTimeout(myalert,2000);
var time2 = setInterval(myalert,2000);
/
clearTimeout(time1);
clearInterval(time2);
*/
function myalert(){
alert('ok!');
}
定時(shí)器制作時(shí)鐘
<script type="text/javascript">
window.onload = function(){
var oDiv = document.getElementById('div1');
function timego(){
var now = new Date();
var year = now.getFullYear();
var month = now.getMonth()+1;
var date = now.getDate();
var week = now.getDay();
var hour = now.getHours();
var minute = now.getMinutes();
var second = now.getSeconds();
var str = '當(dāng)前時(shí)間是：'+ year + '年'+month+'月'+date+'日 '+toweek(week)+' '+todou(hour)+':'+todou(minute)+':'+todou(second);
oDiv.innerHTML = str;
}
timego();
setInterval(timego,1000);
}
function toweek(n){
if(n==0)
{
return '星期日';
}
else if(n==1)
{
return '星期一';
}
else if(n==2)
{
return '星期二';
}
else if(n==3)
{
return '星期三';
}
else if(n==4)
{
return '星期四';
}
else if(n==5)
{
return '星期五';
}
else
{
return '星期六';
}
}

function todou(n){
if(n<10)
{
return '0'+n;
}
else
{
return n;
}
}

</script>
......
<div id="div1"></div>
定時(shí)器制作倒計(jì)時(shí)
<script type="text/javascript">
window.onload = function(){
var oDiv = document.getElementById('div1');
function timeleft(){
var now = new Date();
var future = new Date(2016,8,12,24,0,0);
var lefts = parseInt((future-now)/1000);
var day = parseInt(lefts/86400);
var hour = parseInt(lefts%86400/3600);
var min = parseInt(lefts%86400%3600/60);
var sec = lefts%60;
str = '距離2016年9月12日晚24點(diǎn)還剩下'+day+'天'+hour+'時(shí)'+min+'分'+sec+'秒';
oDiv.innerHTML = str;
}
timeleft();
setInterval(timeleft,1000);
}
</script>
......
<div id="div1"></div>