Promise基本用法

function myTimeout(ms,name){
    return new Promise( (resolve,reject) => void setTimeout(resolve,ms,‘hello ‘ + name) );
}


//then的链式调用
myTimeout(1000,‘Diana‘).then( (receive) => {
  console.log(receive);
  return myTimeout(2000,‘Yasuo‘);
}).then( receive => {
    console.log(receive);
    return myTimeout(1000,‘Kathrine‘);
}).then( receive => void console.log(receive) )



console.log(‘执行！‘);  //会先于promise 执行