WebBrowser获取页面大小

// 1. 获取视口尺寸（不含滚动条）
const viewportWidth = window.innerWidth;
const viewportHeight = window.innerHeight;

// 2. 获取完整文档尺寸
const docWidth = Math.max(
  document.body.scrollWidth, document.documentElement.scrollWidth,
  document.body.offsetWidth, document.documentElement.offsetWidth,
  document.body.clientWidth, document.documentElement.clientWidth
);

const docHeight = Math.max(
  document.body.scrollHeight, document.documentElement.scrollHeight,
  document.body.offsetHeight, document.documentElement.offsetHeight,
  document.body.clientHeight, document.documentElement.clientHeight
);

// 3. 获取特定元素尺寸
const element = document.getElementById('target');
const rect = element.getBoundingClientRect();
console.log(`元素宽度：${rect.width}，高度：${rect.height}`);