You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
30 lines
940 B
30 lines
940 B
1 year ago
|
let timeout = null
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 防抖原理：一定时间内，只有最后一次操作，再过wait毫秒后才执行函数
|
||
|
|
*
|
||
|
|
* @param {Function} func 要执行的回调函数
|
||
|
|
* @param {Number} wait 延时的时间
|
||
|
|
* @param {Boolean} immediate 是否立即执行
|
||
|
|
* @return null
|
||
|
|
*/
|
||
|
|
function debounce(func, wait = 500, immediate = false) {
|
||
|
|
// 清除定时器
|
||
|
|
if (timeout !== null) clearTimeout(timeout)
|
||
|
|
// 立即执行，此类情况一般用不到
|
||
|
|
if (immediate) {
|
||
|
|
const callNow = !timeout
|
||
|
|
timeout = setTimeout(() => {
|
||
|
|
timeout = null
|
||
|
|
}, wait)
|
||
|
|
if (callNow) typeof func === 'function' && func()
|
||
|
|
} else {
|
||
|
|
// 设置定时器，当最后一次操作后，timeout不会再被清除，所以在延时wait毫秒后执行func回调方法
|
||
|
|
timeout = setTimeout(() => {
|
||
|
|
typeof func === 'function' && func()
|
||
|
|
}, wait)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
export default debounce
|