function ajax(options) {
    var options = options || {};
    options.type = (options.type || 'GET').toUpperCase();
    options.dataType = options.dataType || 'json';
    params = formatParams(options.data);

    //创建-第一步
    var xhr;
    //非IE6
    if (window.XMLHttpRequest) {
        xhr = new XMLHttpRequest();
    } else {
        //ie6及其以下版本浏览器
        xhr = ActiveXObject('Microsoft.XMLHTTP');
    }

    //接收-第三步
    xhr.onreadystatechange = function () {
        if (xhr.readyState == 4) {
            var status = xhr.status;
            if (status >= 200 && status < 300) {
                options.success && options.success(xhr.responseText, xhr.responseXML);
            } else {
                options.error && options.error(status);
            }
        }
    }

    //连接和发送-第二步
    if (options.type == 'GET') {
        xhr.open('GET', options.url + '?' + params, true);
        xhr.send(null);
    } else if (options.type == 'POST') {
        xhr.open('POST', options.url, true);
        //设置表单提交时的内容类型
        xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
        xhr.send(params);
    }else if (options.type == 'HEAD') {
        xhr.open('Head', options.url + '?' + params, true);
        xhr.send(null);
    }
}

//格式化参数
function formatParams(data) {
    var arr = [];
    for (var name in data) {
        arr.push(encodeURIComponent(name) + '=' + encodeURIComponent(data[name]));
    }
    // arr.push(('v='+Math.random()).replace('.',''));
    return arr.join('&');
}

function OpenDwSource() {
    var host = "http://localhost:19882"
    var xsource = '<div style="width:300px;position: absolute;border:1px solid #dddddd;background: #eeeeee;left:0; right:0;top:89px;margin:auto;box-shadow:0 1px 5px rgb(0 0 0 / 5%);border-radius:6px;z-index:10000000;">';
    xsource += '<div id="xcanner-content" style="padding: 15px 20px 0px 20px;">';
    xsource += '<h4 style="margin:0px;">请选择扫描仪:</h4>';
    xsource += '<div id="xscanner-sourcelist">';
    xsource += '<ul style="background: #fff;list-style: none;margin:0px;padding:0px;border-left:2px solid #777777;border-top:2px solid #777777;">';
    xsource += '</ul></div>';
    xsource += '<div><button id="xscanner-confirm-btn" style="margin:10px 10px 20px 0px;min-width: 80px;">确定</button><button id="xscanner-cancel-btn" style="margin:10px 10px 20px 0px;min-width: 80px;">取消</button></div>';
    var sourcediv = document.createElement("div")
    sourcediv.id = "xscanner-model"
    sourcediv.innerHTML = xsource;
    document.getElementsByTagName("body")[0].appendChild(sourcediv)
    // 
    ajax({
        url: host + '/xscanSourceList.aspx',
        type: 'get',
        dataType: 'json',
        data: {},
        success: function (response, xml) {
            var listr = ""
            JSON.parse(response).forEach((item, index) => {
                if (index == 0) {
                    listr += "<li style='background:rgb(199, 222, 252);'>" + item + "</li>";
                } else {
                    listr += "<li>" + item + "</li>";
                }
            })
            document.getElementById("xscanner-sourcelist").children[0].innerHTML = listr;
        },
        error: function (status) {
            //失败后执行的代码
        }
    });
    // 确定
    document.getElementById("xscanner-confirm-btn").addEventListener("click", function () {
        ajax({
            url: host + '/xscanAction.aspx',
            type: 'GET',
            dataType: 'json',
            data:{tid:123},
            success: function (response, xml) {
                if (response) {

                }
            },
            error: function (status) {
                //失败后执行的代码
            }
        });
        var last = null;
        var counter = "15982"
        var i = 0;
        var timer = window.setInterval(function () {
            i += 1
            var xscannercontainer = document.getElementById("XScannerContainer")
            xscannercontainer.style = "overflow:scroll;padding:10px 20px 20px 20px;"
            last = xscannercontainer.firstChild;
            ajax({
                url: host + '/xscanImgUri.aspx',
                type: 'GET',
                dataType: 'json',
                data: {t:new Date().getTime()},
                success: function (response, xml) {
                    console.log(response)
                    if (response) {
                        response.split(",").forEach((item,index)=>{
                            var img = document.createElement("img")
                            img.src = host + "/xscanImgReview.aspx?imgid="+item
                            img.style = "width:100%;margin-bottom:10px;"
                            if (last) {
                                xscannercontainer.insertBefore(img, last)
                            } else {
                                xscannercontainer.append(img)
                            }
                        })
                    }

                },
                error: function (status) {
                    //失败后执行的代码
                }
            });
        }, 1000)
        document.getElementById("xscanner-model").remove();
    })
    // 取消
    document.getElementById("xscanner-cancel-btn").addEventListener("click", function () {
        document.getElementById("xscanner-model").remove();
    })
}