function postCMD(cmd){
        httpRequest("http://127.0.0.1:7111/track/" + cmd, "POST", null, function(resultS, status){
            if(status === 200){
            }else{
                /// \todo warning message
            }
        })
    }

function httpRequest(serverUrl, method, data, callback){
	var xhr = new XMLHttpRequest();
	xhr.onreadystatechange = function(){
		if (xhr.readyState === XMLHttpRequest.HEADERS_RECEIVED){
        
		}else if(xhr.readyState === XMLHttpRequest.DONE){
    		if(callback){
				callback(xhr.responseText.toString() ,xhr.status)
			}
		}
	}
	xhr.open(method, serverUrl);
	xhr.timeout = 3000;
	xhr.setRequestHeader("Connection", "close");
	if(!data){
    	xhr.send();
    }else{
		xhr.send(data);
	}
}

var xhr = new XMLHttpRequest();
xhr.open("GET", "http://127.0.0.1:12345/");
xhr.setRequestHeader("Content-Type", "application/json");
xhr.setRequestHeader("Authorization", "Bearer your_token_here");
xhr.timeout = 3000;

xhr.onreadystatechange = function() {
    console.log("當(dāng)前 readyState:", xhr.readyState);
    if (xhr.readyState === XMLHttpRequest.DONE) { // 請求完成
        if (xhr.status === 200) { // 成功響應(yīng)
            console.log("請求成功！");
            console.log("響應(yīng)數(shù)據(jù):", xhr.responseText);
        } else {
            console.error("請求失敗，狀態(tài)碼:", xhr.status);
        }
    }
}

xhr.onerror = function() {
    console.error("網(wǎng)絡(luò)錯誤: 無法連接到服務(wù)器");
}

// 對于ontimeout、onload、onprogress都是同理

// GET時候可用
xhr.send();

// 通用
var data = '';
data = "...."; // 數(shù)據(jù)
xhr.send(data);

 function uploadFile() {
     var xhr = new XMLHttpRequest();
     var formData = new FormData();
     formData.append("file", fileInput.files[0]); // 假設(shè) fileInput 是文件選擇框
     formData.append("comment", "QML 文件上傳測試");
 
     xhr.open("POST", "https://api.example.com/upload");
     xhr.onreadystatechange = function() {
         if (xhr.readyState === XMLHttpRequest.DONE) {
             console.log("上傳結(jié)果:", xhr.status);
         }
     };
     xhr.send(formData);
 }

 function loadImage() {
     var xhr = new XMLHttpRequest();
     xhr.open("GET", "https://example.com/image.png");
     xhr.responseType = "arraybuffer";
     xhr.onreadystatechange = function() {
         if (xhr.readyState === XMLHttpRequest.DONE && xhr.status === 200) {
             var byteArray = new Uint8Array(xhr.response);
             var imageData = "data:image/png;base64," + btoa(String.fromCharCode.apply(null, byteArray));
             imageElement.source = imageData; // 顯示圖片
         }
     };
     xhr.send();
 }

function makeCORSRequest() {
    var xhr = new XMLHttpRequest();
    xhr.open("GET", "https://api.example.com/data", true);
    xhr.withCredentials = true; // 允許跨域請求攜帶憑據(jù)

    xhr.onreadystatechange = function() {
        if (xhr.readyState === XMLHttpRequest.DONE) {
            if (xhr.status === 200) {
                console.log("跨域請求成功:", xhr.responseText);
            } else {
                console.error("跨域請求失敗，狀態(tài)碼:", xhr.status);
            }
        }
    };

    xhr.send();
}

function downloadFile(url) {
    var xhr = new XMLHttpRequest();
    xhr.open("GET", url, true);

    xhr.onprogress = function(event) {
        if (event.lengthComputable) {
            var percentComplete = (event.loaded / event.total) * 100;
            console.log("下載進度:", percentComplete.toFixed(2) + "%");
        } else {
            console.log("無法計算總大小，正在下載...");
        }
    };

    xhr.onload = function() {
        if (xhr.status === 200) {
            console.log("文件下載完成！");
        } else {
            console.error("下載失敗，狀態(tài)碼:", xhr.status);
        }
    };

    xhr.onerror = function() {
        console.error("網(wǎng)絡(luò)錯誤: 無法連接到服務(wù)器");
    };

    xhr.send();
}

function uploadFile(fileInput) {
    var xhr = new XMLHttpRequest();
    var formData = new FormData();
    formData.append("file", fileInput.files[0]);

    xhr.open("POST", "https://api.example.com/upload", true);

    xhr.upload.onprogress = function(event) {
        if (event.lengthComputable) {
            var percentComplete = (event.loaded / event.total) * 100;
            console.log("上傳進度:", percentComplete.toFixed(2) + "%");
        } else {
            console.log("無法計算總大小，正在上傳...");
        }
    };

    xhr.onload = function() {
        if (xhr.status === 200) {
            console.log("文件上傳成功！");
        } else {
            console.error("上傳失敗，狀態(tài)碼:", xhr.status);
        }
    };

    xhr.onerror = function() {
        console.error("網(wǎng)絡(luò)錯誤: 無法連接到服務(wù)器");
    };

    xhr.send(formData);
}