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/**
* @desc 函数防抖
* @param func 目标函数
* @param wait 延迟执行毫秒数
* @param immediate true - 立即执行, false - 延迟执行
*/
export const debounce = function(func, wait = 1000, immediate = true) {
let timer;
console.log(1);
return function() {
console.log(123);
let context = this,
args = arguments;
if (timer) clearTimeout(timer);
if (immediate) {
let callNow = !timer;
timer = setTimeout(() => {
timer = null;
}, wait);
if (callNow) func.apply(context, args);
} else {
timer = setTimeout(() => {
func.apply(context, args);
}, wait)
}
}
}
/**
* @desc 函数节流
* @param func 函数
* @param wait 延迟执行毫秒数
* @param type 1 使用表时间戳,在时间段开始的时候触发 2 使用表定时器,在时间段结束的时候触发
*/
export const throttle = (func, wait = 1000, type = 1) => {
let previous = 0;
let timeout;
return function() {
let context = this;
let args = arguments;
if (type === 1) {
let now = Date.now();
if (now - previous > wait) {
func.apply(context, args);
previous = now;
}
} else if (type === 2) {
if (!timeout) {
timeout = setTimeout(() => {
timeout = null;
func.apply(context, args)
}, wait)
}
}
}
}