<!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>Document</title>
</head>
<body>
<div id="btn">点我啊</div>
</body>
<script>
//每wait时间执行一次
function throttle(func, wait) {
var timeout = null;
var previous = null;
return function () {
var now = +new Date();
var context = this;
if (!previous) {
previous = now
}
//下次触发 func 剩余的时间
var remaining = wait - (now - previous);
// 如果小于0，说明离上次触发超过了wait时间，重新算
if (remaining < 0) {
remaining = wait
}
if (!timeout) {
timeout = setTimeout(() => {
previous = +new Date();
timeout = null;
func.apply(context, arguments)
}, remaining);
}
};
}
////无论wait时间内执行多少次，只会在最后一次的wait时间后执行
function debounce(fn, wait) {
var timeout = null;
return function () {
var context = this;
if (timeout) clearTimeout(timeout);
timeout = setTimeout(() => {
fn.apply(context, arguments)
}, wait)
}
}
// function debounce(fn, wait, immediate) {
// var timeout = null;
// var first = true;
// return function () {
// var context = this;
// if (immediate && first) {
// fn.apply(context, arguments)
// first = false
// }
// if (timeout) clearTimeout(timeout);
// timeout = setTimeout(() => {
// fn.apply(context, arguments)
// }, wait)
// }
// }
function say() {
var args = Array.prototype.slice.call(arguments)
console.log(new Date())
console.log('参数：', args.join(','))
}
var a = debounce(say, 3000, true)
document.getElementById('btn').onclick = () => {
a('hello', 'world')
}
</script>
</html>
