1、innerHTML :表示某标签里面的东西
举个例子:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>test1</title>
<style>
div {
width: 100px;
height: 100px;
}
</style>
<script>
window.onload = function() {
var btn = document.getElementById('btn');
var oDiv = document.getElementById('div1');
var txt = document.getElementById('text');
btn.onclick = function() {
oDiv.innerHTML = txt.value;
};
};
</script>
</head>
<body>
<input type="text" id="text">
<input type="button" value="发送" id="btn">
<div id="div1" class="active">
</div>
</body>
</html>
2、定时器setInterval(show,1000):间隔型定时器,每隔1000毫秒,就执行show动作,一直执行
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>text2</title>
<style>
</style>
<script>
function show() {
alert('a');
};
setInterval(show, 1000);
</script>
</head>
<body>
</body>
</html>
3、定时器setTimeout:延时型。只执行一次
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>text1</title>
<style>
</style>
<script>
function show() {
alert('a');
};
setTimeout(show, 1000);
</script>
</head>
<body>
</body>
</html>
4、设置开启和关闭定时器的按钮
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>text4</title>
<style>
</style>
<script>
function show() {
alert('Hello');
}
window.onload = function() {
var oBtn1 = document.getElementById('btn1');
var oBtn2 = document.getElementById('btn2');
var time = null;
oBtn1.onclick = function() {
time = setInterval(show, 2000);
// 开启定时器的名字为time
};
oBtn2.onclick = function() {
clearInterval(time);
};
};
</script>
</head>
<body>
<input id="btn1" type="button" value="开启定时器">
<input id="btn2" type="button" value="关闭定时器">
</body>
</html>
5、获取电脑时间
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>text5</title>
<script>
window.onload = function() {
var oDate = new Date();
// 创建一个新的对象
// alert(oDate.getHours());
// 获取电脑时间的小时值
// alert(oDate.getMinutes());
// alert(oDate.getSeconds());
var str = oDate.getHours() + '点' + oDate.getMinutes() + '分' + oDate.getSeconds() + '秒';
alert(str);
};
</script>
</head>
<body>
</body>
</html>