经典面试题手写

JavaScript

function helloWorld() {
    console.log('Hello, world!');
}

Python

def hello_world():
    print("Hello, world!")

new_

原型链 + this指向

function new_(func, ...params) {
    const obj = Object.create(func.prototype);
    const result = func.apply(obj, params);
    return typeof result === "object" ? result : obj;
}

防抖节流

防抖：截停动作频繁触发

节流：降低动作频次

function throttle(func, timeout) {
    let timer = null
    return function(...props) {
        if(timer) {
            return
        }
        timer = setTimeout(() => {
            func(...props);
            clearTimeout(timer)
            timer = null
        }, timeout)
    }
}

function debounce(func, timeout) {
  let timer = null
  return () => {
    if(timer){
        clearTimeout(timer);
    }

    timer = setTimeout(() => {
        func(...props);
        clearTimeout(timer)
        timer = null
    }, timeout)
  }
}