robinjl

// 1*2*3*...100
function recrusive(num){
  if(num === 1){
    return num;
  }else{
    return num*recrusive(num-1)
  }
}

// 菜单递归 后端返回递归结构，前端更换键名 例如 url -> path

robinjl

// source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce

let people = [
  { name: 'Alice', age: 21 },
  { name: 'Max', age: 20 },
  { name: 'Jane', age: 20 }
];

function groupBy(objectArray, property) {
  return objectArray.reduce(function (acc, obj) {

robinjl

function getRandomColor() {
  const letters = '0123456789ABCDEF';
  let color = '#';
  for (let i = 0; i < 6; i++) {
    color += letters[Math.floor(Math.random() * 16)];
  }
  return color;
}