SOURCE

// let num1 = [{"id":10,"age":5},{"id":1,"age":2},{"id":14,"age":20},{"id":11,"age":25}];
// let num2 = [{"id":1,"age":23},{"id":13,"age":8},{"id":6,"age":7},{"id":10,"age":20}];

//  num1.sort((a,b)=>   {
//     if(a.id===b.id){//单个等号会有赋值作用
//         return a.age-b.age;//纯数字比较才可以这么写
//     }else{
//         return b.id-a.id;
//     }
// })

// console.table(num1);

let message = ["Ana","John","ada","dave","Ben"];

let m = message.sort((a,b)=>{
if( a.toLowerCase()<b.toLowerCase()){//字符串比较要这么写
    return -1;
}else if( a.toLowerCase()>b.toLowerCase()){
    return 1
}
  return 0;
})
console.log(m);

let num = [1,2,3,4,5,6,7,8,9,0,10,11,12,13];
let even = num.find((ele,index,arr)=>{
    return ele%2==0;
})
let evenIndex = num.findIndex((ele,index,arr)=>{
    return ele%2 == 0;
})
console.log(num.includes(20));