let a = () => {
return new Promise(resolve => {
console.warn('promise a start')
resolve('P-a finished')
})
}
let b = (parms) => {
return new Promise(resolve => {
console.warn(parms)
resolve('P-b finished')
})
}
let c = (parms) => {
return new Promise(resolve => {
console.warn(parms)
resolve('P-c finished')
})
}
a().then(b).then(c).then(res => console.warn(res))
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