how can i fetch the api in javascript data code example

Example 1: get data from fetch api into variable

<script>
function getFromAPI(url, callback){
  var obj;
  fetch(url)
    .then(res => res.json())
    .then(data => obj = data)
    .then(() => callback(obj))
 }

getFromAPI('https://jsonplaceholder.typicode.com/posts', getData);

function getData(arrOfObjs){
  var results = "";
  arrOfObjs.forEach( (x) => {
    results += "<p> Id: " + x.id + "<ul>"
    Object.keys(x).forEach( (p) => {
        results += "<li>" + (p + ": " + x[p]) + "</li>";
    });
    results += "</ul> </p> <hr>"
  })
  results += "";
  document.getElementById("myDiv").innerHTML = results;
}

</script>

Example 2: $_GET data using javascript

function $_GET(q,s) {
    s = (s) ? s : window.location.search;
    var re = new RegExp('&'+q+'=([^&]*)','i');
    return (s=s.replace(/^\?/,'&').match(re)) ?s=s[1] :s='';
}

console.log($_GET("myvariable"));