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
定時(shí)器的基本用法
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>定時(shí)器的基本用法</title>
<style type="text/css">
</style>
<script type="text/javascript">
//單次定時(shí)器
var timer = setTimeout(function(){
alert('hello!');
}, 3000);
//清除單次定時(shí)器
clearTimeout(timer);
//反復(fù)循環(huán)定時(shí)器
var timer2 = setInterval(function(){
alert('hi~~~');
}, 2000);
//清除反復(fù)循環(huán)定時(shí)器
clearInterval(timer2);
</script>
</head>
<body>
</body>
</html>
定時(shí)器動(dòng)畫
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>定時(shí)器動(dòng)畫</title>
<style type="text/css">
.box{
width: 100px;
height: 100px;
background-color: gold;
position: fixed;
left: 20px;
top: 20px;
}
</style>
<script type="text/javascript">
window.onload = function(){
var oBox = document.getElementById('box');
var left = 20;
//反復(fù)循環(huán)定時(shí)器，每30毫秒修改一次盒子的left值
var timer = setInterval(function(){
left += 2;
oBox.style.left = left + 'px';
//當(dāng)left值大于700時(shí)停止動(dòng)畫（清除定時(shí)器）
if(left > 700){
clearInterval(timer);
}
},30);
}
</script>
</head>
<body>
<div class="box" id="box"></div>
</body>
</html>
