setInterval
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
var i = 0
var timer = setInterval(function(){
console.log(i++)
if(i === 5){
clearInterval(timer)
}
},1000)
</script>
</body>
</html>
setTimeout
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<button onclick="fn()">停止定时器</button>
<script>
var timer = setTimeout(function(){
console.log(123)
},3000)
function fn(){
clearTimeout(timer)
}
</script>
</body>
</html>
window事件和属性
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script>
var box = document.getElementById('box')
console.log(box)
window.onload = function(){
var box = document.getElementById('box')
console.log(box)
}
</script>
</head>
<body style="height: 10000px;width: 10000px;">
<div id = "box">box</div>
<script>
window.onscroll = function(){
var top = document.documentElement.scrollTop || document.body.scrollTop
var left = document.documentElement.scrollLeft || document.body.scrollLeft
console.log(top,left)
}
window.onresize = function(){
console.log(window.innerWidth,window.innerHeight)
}
</script>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
console.log(window)
</script>
</body>
</html>
