- 节流：比如一个抢购按钮，用户在几秒内只能点击一次（就是技能冷却中）
const throttle = (fn ,time) => {
let timer = null
return ( ...args ) => {
if(timer) {return}
f.call(undefined, ...args)
timer = setTimeout ( () => {
timer = null
}, time)
}
}
- 防抖：比如网页拖动，一直拖动网页内容格式就不会改变，停留下来才会改变（就是回城被打断）
const debounce = (fn ,time) => {
let timer = null
return (...args ) => {
if (timer !===null) {
clearTimeout(timer) //打断
}
timer = setTimerout( () => {
fn.call(undefined, ...args)
timer = null
},time}
}
}
