javascript - 如何在没有jQuery的情况下进行AJAX调用？(How to make an AJAX call without jQuery?)

Question

如何在不使用jQuery的情况下使用JavaScript进行AJAX调用？

  ask by discky translate from so

Answer 1

With "vanilla" JavaScript:

(使用“香草” JavaScript：)

<script type="text/javascript">
function loadXMLDoc() {
    var xmlhttp = new XMLHttpRequest();

    xmlhttp.onreadystatechange = function() {
        if (xmlhttp.readyState == XMLHttpRequest.DONE) {   // XMLHttpRequest.DONE == 4
           if (xmlhttp.status == 200) {
               document.getElementById("myDiv").innerHTML = xmlhttp.responseText;
           }
           else if (xmlhttp.status == 400) {
              alert('There was an error 400');
           }
           else {
               alert('something else other than 200 was returned');
           }
        }
    };

    xmlhttp.open("GET", "ajax_info.txt", true);
    xmlhttp.send();
}
</script>

With jQuery:

(使用jQuery：)

$.ajax({
    url: "test.html",
    context: document.body,
    success: function(){
      $(this).addClass("done");
    }
});