//1开始
function fna(){console.log('1开始');var p = new Promise(function(resolve, reject){        //做一些异步操作setTimeout(function(){console.log('1完毕！');resolve('进行2');//完成（Rejected）}, 6000);// setTimeout(function(){//     console.log('1失败！');//     reject('1没有完成');//失败// }, 1000);
    });return p;
}//2开始
function fnb(data){console.log('2开始' + data);var p = new Promise(function(resolve, reject){        //做一些异步操作setTimeout(function(){console.log('2完毕!');resolve('进行3');}, 2000);});return p;
}//3开始
function fnc(data){console.log('3开始' + data);var p = new Promise(function(resolve, reject){        //做一些异步操作setTimeout(function(){console.log('3完毕!');resolve('123都完成');}, 2000);});return p;
}fna()
.then(function(data){ //成功的return fnb(data);
})
.catch(function(data){ //失败的
    console.log(data );
})
.then(function(data){return fnc(data);
})
.then(function(data){//throw new Error('发现错误！');//捕捉错误
    console.log(data);
});

function cutUp(){console.log('1开始');var p = new Promise(function(resolve, reject){        //做一些异步操作setTimeout(function(){console.log('1完毕！');resolve('准备好1');}, 1000);});return p;
}function boil(){console.log('2开始');var p = new Promise(function(resolve, reject){        //做一些异步操作setTimeout(function(){console.log('2完毕！');resolve('准备好2');}, 6000);});return p;
}Promise
.all([cutUp(), boil()])//all 方法在所有异步操作执行完后才执行下面函数
.then(function(results){console.log("12准备完毕：");console.log(results);
});

async function asyncValue(value) { //函数前面的async关键字，表明该函数将返回一个Promise对象console.log('1');//当遇到await关键字等待 await后的函数执行完成才会继续执行await timeout(6000).then(function(data){console.log(data);
}).catch(function(data){console.log(data);
})console.log('完毕');return value;
}
asyncValue();//调用
function timeout(ms) {return new Promise((resolve) => {setTimeout(()=>{resolve('干净的碗筷');},ms);});
}