单体创建iframe和div 弹窗

// 创建div

var createWindow = function(){
    var div = document.createElement("div");
    div.innerHTML = "我是弹窗内容";
    div.style.display = 'none';
    document.body.appendChild(div);
    return div;
};

// 创建iframe

var createIframe = function(){
    var iframe = document.createElement("iframe");
    document.body.appendChild(iframe);
    return iframe;
};

// 获取实例的封装代码

var getInstance = function(fn) {
    var result;
    return function(){
        return result || (result = fn.call(this,arguments));
    }
};

// 测试创建div

var createSingleDiv = getInstance(createWindow);
document.getElementById("Id").onclick = function(){
    var win = createSingleDiv();
    win.style.display = "block";
};

// 测试创建iframe

var createSingleIframe = getInstance(createIframe);
document.getElementById("Id").onclick = function(){
    var win = createSingleIframe();
    win.src = "http://cnblogs.com";
};