  将TypeScript/Angular客户端生成的服务器端文本文件中的问题

"问题在于，我正试图通过Client浏览器发起的请求将文本内容写入服务器端文件。NOTE:这已经是相当长的时间以来，我对TypeScript/PHP/服务器的工作了，所以请不要假设我默认就知道一切：）我根据自己的代码进行了修改：/问题/11240996/将JavaScript输出到文件中-server

我最终得到了一个使用PHP服务器端创建文件"h.txt"的代码。确实是创建了一个空文件"h.txt"，但它的内容"456"从未写入：我从未收到关于原因的错误消息。"456"是文件的内容，

服务器端

//PHP code:  (A little elaborate, but it should work)

//h.txt is created, but its content is never written: read only problem?? I can't find how to see if //the file is read only or not)

//The php Code is located on Server

//On the Client side I have the following code:
//The Client is written in Angular, and the function that triggers the data exchange with server

testWriteToServerFile() {

        let data: string = "456";// this is your data that you want to pass to the server 
        //next you would initiate a XMLHTTPRequest as following (could be more advanced):

        var url = url to the server side PHP code that will receive the data.

        var http = new XMLHttpRequest();
        http.open("POST", url, true);

        //Send the proper header information along with the request
        http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
        http.setRequestHeader("Content-length", data.length.toString());
        http.setRequestHeader("Connection", "close");

         http.onreadystatechange = function() {//Call a function when the state changes.
            if(http.readyState == 4 && http.status == 200) {
                alert(http.responseText);//check if the data was received successfully.
            }
        }
        http.send(data);
}

(我试图包括适当的链接到服务器等，但这篇文章被归类为垃圾邮件?)

服务器上的h.txt对客户端是只读的问题吗?解决方案是什么?

我希望能够将文本写入服务器上的h.txt文件。