如何对bitstamp发出HTTP请求？

Question

I'm trying to use an API from bitstamp to fetch a currency trading price on my webpage.

I have researched this problem, but I still cannot get it to work as it always returns ERROR

The link used is https://www.bitstamp.net/api/ticker/ and the response should be last

Here is my code:

var xhr = new XMLHttpRequest();
xhr.open("GET", "https://www.bitstamp.net/api/ticker/", true);
xhr.send();
xhr.addEventListener("readystatechange", processRequest, false);
function processRequest(e) {
if (xhr.readyState == 4 && xhr.status == 200) {
     var response = JSON.parse(xhr.responseText);
     window.alert(response.last);
}
else {
    window.alert("ERROR");
} }

Answer 1

Try this:

 function loadXMLDoc() { var xhttp = new XMLHttpRequest(); xhttp.onreadystatechange = function() { if (this.readyState == 4 && this.status == 200) { var jsonRes= JSON.parse(this.responseText); if (jsonRes.hasOwnProperty('last')) { document.getElementById("demo").innerHTML = jsonRes.last; alert(jsonRes.last); } } }; xhttp.open("GET", "https://www.bitstamp.net/api/ticker", true); xhttp.send(); } 

 <h2>Using the XMLHttpRequest object</h2> <button type="button" onclick="loadXMLDoc()">Change Content</button> <p>last attribute is: <span id="demo"></span></p> 

Answer 2

Here is one way:

<script src="./jquery.min.js">
//none secure web page ?
    jQuery.get("https://www.bitstamp.net/api/ticker/", function (data, status)
    {
        // use response here; jQuery passes it as the first parameter
        var response = JSON.parse(data);
        window.alert(response.last);
            console.log("MyFunc: " + "response : " + response + "\nStatus: " + status);
    });

</script>

Answer 3

var xhr = new XMLHttpRequest();
xhr.open("GET", "https://www.bitstamp.net/api/ticker/", true);
xhr.send();
xhr.addEventListener("readystatechange", processRequest, false);

function processRequest(e) { 
  if (xhr.readyState == 4) {
    if (xhr.status == 200) {
      var response = JSON.parse(xhr.responseText);
      window.alert(response.last);
    } else {
      window.alert("ERROR");
    }
  }
}