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| <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>防抖和节流</title>
<style>
button {
width: 100px;
height: 50px;
}
.log {
width: 100%;
height: 30px;
border: 1px solid
margin-top: 10px;
}
</style>
</head>
<body>
<button id="debounced">Debounced</button>
<button id="throttled">Throttled</button>
<div id="log1" class="log"></div>
<div id="log2" class="log"></div>
<script>
/*
节流说白了就是每ms执行一次函数，
防抖就是 我最后一次触发后ms后执行一次回调函数
*/
/*debounced（防抖动）函数，该函数会从上一次被调用后，延迟 wait 毫秒后调用 fn 方法。*/
function debounce(fn, wait, options) {
// 等待时间
wait = wait || 0
// 点击次数
let timerId;
console.log("timerId:", timerId);
// 这个函数的功能是：
//
return function() {
if (timerId) {
clearTimeout(timerId);
timerId = null;
}
timerId = setTimeout(function() {
fn();
}, wait);
console.log("timerId:", timerId);
}
}
// 节流函数，在 wait 秒内最多执行 fn 一次的函数。
function throttle(fn, wait, options) {
wait = wait || 0;
let timerId;
let lastTime = 0;
return function() {
let currentTime = new Date();
if (currentTime >= lastTime + wait) {
fn();
lastTime = currentTime;
} else {
if (timerId) {
clearTimeout(timerId);
timerId = null;
}
timerId = setTimeout(function() {
fn();
}, wait);
}
}
}
let debouncedBtn = document.getElementById('debounced');
let throttledBtn = document.getElementById('throttled');
let log1 = document.getElementById('log1');
let log2 = document.getElementById('log2');
function handleDebounce() {
log1.innerHTML += 'debounced';
console.log("debounced");
}
function handleThrottle() {
log2.innerHTML += 'throttle';
console.log("throttle");
}
debouncedBtn.addEventListener('click', debounce(handleDebounce, 2000));
throttledBtn.addEventListener('click', throttle(handleThrottle, 2000));
</script>
</body>
</html>
|
