用Javascript调用API

Question

调用这个api的正确方法是什么？api的网址是：https://www.bitstamp.net/api/ticker/？

我想读“高”的价值..。

<p id="demo"></p>
<script>
var xmlhttp = new XMLHttpRequest();
    xmlhttp.onreadystatechange = function() {
        if (this.readyState == 4 && this.status == 200) {
        var myObj = JSON.parse(this.responseText);
        document.getElementById("demo").innerHTML = myObj.high;
    }
};
xmlhttp.open("GET", "https://www.bitstamp.net/api/ticker/", true);
xmlhttp.send();
</script>

我遗漏了什么？Thx!！

Answer 1

在URL中添加时间戳使其对我有效：

<p id="demo"></p>
<script>
    var xmlhttp = new XMLHttpRequest();
        xmlhttp.onreadystatechange = function() {
            if (this.readyState == 4 && this.status == 200) {
            var myObj = JSON.parse(this.responseText);
            document.getElementById("demo").innerHTML = myObj.high;
        }
    };
    xmlhttp.open("GET", "https://www.bitstamp.net/api/ticker/?u" + new Date().getTime(), true);
    xmlhttp.send();
</script>

​

        var xmlhttp = new XMLHttpRequest();
            xmlhttp.onreadystatechange = function() {
                if (this.readyState == 4 && this.status == 200) {
                var myObj = JSON.parse(this.responseText);
                document.getElementById("demo").innerHTML = myObj.high;
            }
        };
        xmlhttp.open("GET", "https://www.bitstamp.net/api/ticker/?u" + + new Date().getTime(), true);
        xmlhttp.send();

<p id="demo"></p>

​