如图所示 点击空白处关闭此div

document.addEventListener('click', function(e) {//监听页面点击事件
        var screenDoc = document.querySelector('.controlHead');//需要关闭的div
        var control = document.querySelector('.control');//设置的按钮
        if (screenDoc && !screenDoc.contains(e.target) && !control.contains(e.target)) {
            screenDoc.style.display = "none";
            conIs = true;
        }
    }, false)