我正在尝试实现一个与
javascript中的promise一起使用的去抖函数.这样,每个调用者都可以使用Promise消耗“debounced”函数的结果.这是迄今为止我能想到的最好的：
function debounce(inner,ms = 0) {
let timer = null;
let promise = null;
const events = new EventEmitter(); // do I really need this?
return function (...args) {
if (timer == null) {
promise = new Promise(resolve => {
events.once('done',resolve);
});
} else {
clearTimeout(timer);
}
timer = setTimeout(() => {
events.emit('done',inner(...args));
timer = null;
},ms);
return promise;
};
}
理想情况下,我想实现这个实用程序函数而不引入依赖于EventEmitter(或实现我自己的基本版本的EventEmitter),但我想不出办法.有什么想法吗？
解决方法
我找到了一个更好的方法来实现承诺：
function debounce(inner,ms = 0) {
let timer = null;
let resolves = [];
return function (...args) {
// Run the function after a certain amount of time
clearTimeout(timer);
timer = setTimeout(() => {
// Get the result of the inner function,then apply it to the resolve function of
// each promise that has been created since the last time the inner function was run
let result = inner(...args);
resolves.forEach(r => r(result));
resolves = [];
},ms);
return new Promise(r => resolves.push(r));
};
}
我仍然欢迎建议,但新的实现回答了我关于如何实现这个函数的原始问题,而不依赖于EventEmitter(或类似的东西).
