[JavaScript] 防抖函数debounce的实现及其应用
2019-03-05 本文已影响0人
jiansheng
<!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>debounce</title>
</head>
<body>
<button id="btn_0">simple button</button>
<button id="btn_1">debounce button</button>
<button id="btn_2">debounce button(immediate)</button>
<script>
(function () {
function debounce(fn, wait = 300, immediate = false) {
let timerId = null;
return function () {
const self = this;
const args = arguments;
if (timerId) {
clearTimeout(timerId);
}
if (immediate) {
if (!timerId) {
fn.apply(self, args);
}
timerId = setTimeout(function () {
timerId = null;
}, wait)
} else {
timerId = setTimeout(function () {
fn.apply(self, args);
}, wait);
}
}
}
function clg(a, b, c) {
console.log(a, b, c);
}
// 没有加debounce
document.getElementById('btn_0')
.addEventListener('click', function (event) {
clg(1, 2, 3);
});
// 加了debounce，延迟时间内多次点击按钮，只有最后一次触发clg
const debouncedClg = debounce(clg);
document.getElementById('btn_1')
.addEventListener('click', function (event) {
debouncedClg(1, 2, 3);
});
// 加了debounce，启用immediate，延迟时间内多次点击按钮，只有第一次触发clg
const debouncedImmediateClg = debounce(clg, 300, true);
document.getElementById('btn_2')
.addEventListener('click', function (event) {
debouncedImmediateClg(1, 2, 3);
});
})();
</script>
</body>
</html>
