// 模拟 post 异步接口 begainlet post1 = ()=> {    return new Promise((resolve, reject) => {        setTimeout(()=>{            reject('reject 2000')        } , 2000)    })}let post2 = ()=> {    return new Promise((resolve, reject) => {        setTimeout(()=>{            resolve('success 1000')        } , 1000)    })}let post3 =  ()=> {    return new Promise((resolve, reject) => {        setTimeout(()=>{            resolve('success 3000')        } , 3000)    })}let post4 =  ()=> {    return new Promise((resolve, reject) => {        setTimeout(()=>{            reject('reject 4000')        } , 4000)    })}// 模拟 post 异步接口 end

　　2、

// 模拟 post 异步接口   try catch 方式 end const getByApi5 = ()=> {
       return new Promise(async (resolve, reject)=>{
           try {
               const data = await post1()             console.log('getP5 try 2s')             resolve(data)         }catch(e){
               console.log('getP5 catch 2s')             reject(e)         }     }) } const getByApi6 = ()=> {
       return new Promise(async (resolve, reject)=>{
           try {
               const data = await post2()             console.log('getP6 try 1s')             resolve(data)         }catch(e){
               console.log('getP6 catch 1s')             reject(e)         }     }) } const getByApi7 = ()=> {
       return new Promise(async (resolve, reject)=>{
           try {
               const data = await post3()             console.log('getP7 try 3s')             resolve(data)         }catch(e){
               console.log('getP7 catch 3s')             reject(e)         }     }) } const getByApi8 = ()=> {
       return new Promise(async (resolve, reject)=>{
           try {
               const data = await post4()             console.log('getP8 try 4s')             resolve(data)         }catch(e){
               console.log('getP8 catch 4s')             reject(e)         }     }) }

　　3、

Promise.all([getByApi5(), getByApi6(), getByApi7(), getByApi8()]).then((result) => {    console.log('result')    console.log(result)}).catch((error) => {    console.log('error')    console.log(error)})

　　4、区别在于， 2s 后， 走catch( error, 返回 reject 2000),  不会走 then

getP6 try 1sgetP5 catch 2serrorreject 2000getP7 try 3sgetP8 catch 4s