function A(params, callback){
callback(params+1)
}
function B(num1){
return new Promise((resolve, reject)=>{
A(num1, (num)=>{
console.log(num) //4
resolve(num)
})
})
}
let a = 3;
let num = B(a).then((data)=>{
console.log(data) //4
}); 网友回复
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