promise与await的用法

save1(){
    return new Promise((resolve, reject)=> {
        console.log('ajax1')
    }) 
}

save2(){
    return new Promise((resolve, reject)=> {
        console.log('ajax2')
        resolve(true)
    })
}

同时发送两个ajax请求:
async saveAll() {
    const flag1 = await this.save1()
    const flag2 = await this.save2()
    if (flag1 && flag2) {
        console.log('allSuccess')
        console.log('nextAjax')
    }
}