Get current URL in web browser

<script>
  var url = window.location.href;
  alert(url);
</script>

Get a timestamp in JavaScript

var timestamp = Math.floor(Date.now() / 1000);
alert(timestamp);

Ajax (注意不能跨域)

get: 

<html>
    <head>
    <title>Test</title>
    </head>
    <body>
    Test JavaScript.
    <body>
    <script>
        var url = "http://localhost:8000/js";
        var xhr = new XMLHttpRequest();
        xhr.onreadystatechange = function() {
            if (xhr.readyState == XMLHttpRequest.DONE) {
                alert(xhr.responseText);
            }
        }
        xhr.open('GET', url, true);
        xhr.send(null);
    </script>
</html>

post:

<html>
    <head>
    <title>Test</title>
    </head>
    <body>
    Test JavaScript.
    <body>
    <script>
        var url = "http://localhost:8000/js";
        var params = "timestamp=3801480158&url=http://willowchen.com";
        var xhr = new XMLHttpRequest();
        xhr.onreadystatechange = function() {
            if (xhr.readyState == XMLHttpRequest.DONE) {
                alert(xhr.responseText);
            }
        }
        xhr.open('POST', url, true);
        xhr.send(params);
    </script>
</html>

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