Promise教程之产房里生孩子的故事

//命运之手

function sex(){
    let sex=Math.round(Math.random())===1?'男':'女';
    return sex;
}

function when(){
    let time=Math.random()*1000;
    return time;
}

function shunchan(){
    return Math.round(Math.random());
}

//生孩子的过程
const mama1=new Promise((resolve,reject)=>{
    setTimeout(() => {
        if(shunchan()){
            resolve(sex())
        }else{
            reject('妈妈1难产');
        }
       
    }, when());
});

const mama2=new Promise((resolve,reject)=>{
    setTimeout(() => {
        if(shunchan()){
            resolve(sex())
        }else{
            reject('妈妈2难产');
        }
    }, when());
});

const mama3=new Promise((resolve,reject)=>{
    setTimeout(() => {
        if(shunchan()){
            resolve(sex())
        }else{
            reject('妈妈3难产');
        }
    }, when());
});

const mama4=new Promise((resolve,reject)=>{
    setTimeout(() => {
        if(shunchan()){
            resolve(sex())
        }else{
            reject('妈妈4难产');
        }
    }, when());
});

// 等待结果的过程

mama1.then((res)=>{
    console.log('妈妈1的宝宝是',res);
   
},(err)=>{
    console.log(err);
});

mama2.then((res)=>{
    console.log('妈妈2的宝宝是',res);
   
},(err)=>{
    console.log(err);
});

mama3.then((res)=>{
    console.log('妈妈3的宝宝是',res);
   
},(err)=>{
    console.log(err);
});

mama4.then((res)=>{
    console.log('妈妈4的宝宝是',res);
   
},(err)=>{
    console.log(err);
});