当我有一个模式显示时，我如何禁用父屏幕？

// 获取父屏幕元素
var parentScreen = document.getElementById('parentScreen');

// 阻止事件冒泡
parentScreen.addEventListener('click', function(event) {
  event.stopPropagation();
});

// 取消默认行为
parentScreen.addEventListener('contextmenu', function(event) {
  event.preventDefault();
});

// 创建遮罩层元素
var overlay = document.createElement('div');
overlay.style.position = 'fixed';
overlay.style.top = '0';
overlay.style.left = '0';
overlay.style.width = '100%';
overlay.style.height = '100%';
overlay.style.backgroundColor = 'rgba(0, 0, 0, 0.5)';
overlay.style.zIndex = '9999';

// 将遮罩层添加到父屏幕上
var parentScreen = document.getElementById('parentScreen');
parentScreen.appendChild(overlay);