Encapsulate an ajax request, which successfully returns a promise function, how to call the method in the page and execute the promise callback

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this call will report an error that then is not defined

Javascript
Mar.21,2022

is written as follows: 

return new Promise(res, rej) {
    res(data);
}

you $.ajax itself returns a Promise you can directly return out. If you do not do data processing, there is no need to encapsulate a layer of Promise

.

Brother, you used it wrong. Look, I just wrote a rough idea. Promise wraps the whole thing 

function get(){
    return new Promise(function(resolve,reject){
    let rootId = 
    
    $.ajax()
    
        if(data.status == 200){
            resolve()
        }
        else{
            reject()
        }
    })
}
get().then(res =>{}).catch(res=>{})

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