derek5. 2017-03-31 12:09 采纳率: 100%
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Ajax中的URL open（）

This is my first Ajax program and I can't fix the code because I'm not sure where/what the problem is.

The error(which I'm unable to interpret) while using the debugger is, XMLHttpRequest cannot load http://localhost/function.txt. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access.

function calling()
{
    var x;
    if (window.XMLHttpRequest) {
    x = new XMLHttpRequest();
    } else {

    x = new ActiveXObject("Microsoft.XMLHTTP");
    }

    x.onreadystatechange = function(){
        if(this.readyState == 4 && this.status == 200)
        {
            document.getElementById("block").innerHTML = this.responseText;
        }

    };
    x.open("GET", "http://localhost/function.txt",true);
    x.send();
}

function.txt

<html>
<head></head>
<body>
<h2>Ajax is working</h2>
</body>
</html>
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3条回答 默认 最新

  • weixin_33686714 2017-03-31 12:15
    关注

    Is your js located at the same location as your function.txt?

    For more information about CORS, have a look at this link: https://www.html5rocks.com/en/tutorials/cors/

    UPDATE: This works for me, I think there is maybe something with your Apache settings...

    function calling()
{
  var xhr = new XMLHttpRequest(),
      method = "GET",
      url = "function.txt";

  xhr.open(method, url, true);
  xhr.onreadystatechange = function () {
          if(xhr.readyState === XMLHttpRequest.DONE && xhr.status === 200) {
              alert(xhr.responseText);
          }
      };
  xhr.send();
}

calling();
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