<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>防抖函数三个参数第一遍</title>
</head>
<body>
<div id="main" style="width: 100%; height: 300px; border: 1px solid red"></div>
<button id="btn">取消</button>
<script>
const main = document.getElementById('main');
const btn = document.getElementById('btn');
let count = 1;
function doSomething(e) {
console.log(e);
console.log(this);
count++;
console.log(count);
}
main.onmousemove = debounce(doSomething, 1000, true);
function debounce(func, delay, immediate) {
let timer;
let debounced = function () {
let context = this;
let args = arguments;
clearTimeout(timer);
if (immediate) {
let callNow = !timer;
timer = setTimeout(function () {
timer = null;
}, delay);
if (callNow) func.apply(context, args);
} else {
timer = setTimeout(function () {
func.apply(context, args);
}, delay);
}
};
debounced.cancel = function () {
clearTimeout(timer);
timer = null;
};
return debounced;
}
</script>
</body>
</html>
