什麼是Promise的範例

by thomascsd

HTML

<div id="msg">
</div>
<div id="msg2">
</div>

JavaScript

getData1()
.then(msg => $('#msg').html(msg))
.then(() => getData2())
.then(msg => $('#msg2').html(msg));


function getData1() {
    const url = 'https://jsonplaceholder.typicode.com/posts/4';
    return new Promise((resolve, reject) => {
        $.get(url, ret => resolve(ret.title));
    });
}

function getData2() {
    const url = 'https://jsonplaceholder.typicode.com/posts/5';
    return new Promise((resolve, reject) =>{
        $.get(url, ret => resolve(ret.title));
    });
}