<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>定時器的基本用法</title>
<style type="text/css">
</style>
<script type="text/javascript">
//單次定時器
var timer = setTimeout(function(){
alert('hello!');
}, 3000);
//清除單次定時器
clearTimeout(timer);
//反復(fù)循環(huán)定時器
var timer2 = setInterval(function(){
alert('hi~~~');
}, 2000);
//清除反復(fù)循環(huán)定時器
clearInterval(timer2);
</script>
</head>
<body>
</body>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>定時器動畫</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left值大于700時停止動畫（清除定時器）
if(left > 700){
clearInterval(timer);
}
},30);
}
</script>
</head>
<body>
<div class="box" id="box"></div>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>時鐘</title>
<style type="text/css">
</style>
<script type="text/javascript">
window.onload = function(){
var oBox = document.getElementById('box');
function timeGo(){
var now = new Date();
// alert(now);//彈出美式時間：Wed Jun 20 2018 15:27:13 GMT+0800 (中國標準時間)
var year = now.getFullYear();//2018年
var month = now.getMonth() + 1;//6月彈出5//范圍0-11
var date = now.getDate();//20號
var week = now.getDay();//3//星期幾，西半球時間，范圍0-6，星期日為一周的第一天，為0
var hour = now.getHours();
var minute = now.getMinutes();
var second = now.getSeconds();
// alert(hour + ":" + minute + ":" + second);//15:33:9
oBox.innerHTML = '當前時間是：' + year + '年' + toDouble(month) + '月' + toDouble(date) + '日 ' + toWeek(week) + ' ' + toDouble(hour) + ":" + toDouble(minute) + ":" + toDouble(second);
}
timeGo();
setInterval(timeGo, 1000);
}
//此函數(shù)將星期的數(shù)字轉(zhuǎn)為漢字表示
function toWeek(num){
switch(num){
case 0:
return '星期天';
break;
case 1:
return '星期一';
break;
case 2:
return '星期二';
break;
case 3:
return '星期三';
break;
case 4:
return '星期四';
break;
case 5:
return '星期五';
break;
case 6:
return '星期六';
break;
}
}
//此函數(shù)將不足兩位的數(shù)字前面補0
function toDouble(num){
if(num < 10){
return '0' + num;
}else{
return num;
}
}
</script>
</head>
<body>
<div id="box"></div>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>倒計時</title>
<script type="text/javascript">
window.onload = function(){
//活動第二天要將頁面下線，直接跳轉(zhuǎn)到其它頁面，不會走后面的代碼了
// window.location.href = "http://www.baidu.com";
var oDiv = document.getElementById('div1');
function timeLeft(){
//實際開發(fā)中此時間從服務(wù)器獲取，避免客戶端調(diào)整時間
var now = new Date();
var future = new Date(2018,8,23,24,00,00);
// alert(future - now);//彈出與當前時間相差的毫秒數(shù)：12469935436
var milli = parseInt((future - now)/1000);
//活動當天頁面下線，避免倒計時到點后繼續(xù)計負時
// if(milli <= 0){
// //頁面跳轉(zhuǎn)，不執(zhí)行下面的代碼了
// window.location.;
// }
var day = parseInt(milli / 86400);
var hour = parseInt(milli % 86400 / 3600);
var minute = parseInt(((milli % 86400) % 3600) / 60);
var second = milli % 60;
oDiv.innerHTML = '距離2018年8月23日00時00分00秒還有' + day + '天' + toDouble(hour) + '時' + toDouble(minute) + '分' + toDouble(second) + '秒';
}
timeLeft();
setInterval(timeLeft, 1000);
}
function toDouble(num){
if(num < 10){
return '0' + num;
}else{
return num;
}
}
</script>
</head>
<body>
<div id="div1"></div>
</body>
</html>
