(() => {
  // 获取屏幕大小
  const getScreen = () => {
    const width = window.innerWidth;
    const height = window.innerHeight;
    document.body.style = `
        --width:${width}px;
        --height:${height}px;
      `;
  }
  getScreen()
  // 监听屏幕变化
  window.addEventListener('resize', getScreen);

  // ios 禁用屏幕缩放
  document.documentElement.addEventListener(
    "touchstart",
    function (event) {
      if (event.touches.length > 1) {
        event.preventDefault();
      }
    },
    false
  );

  var lastTouchEnd = 0;
  document.documentElement.addEventListener(
    "touchend",
    function (event) {
      var now = Date.now();
      if (now - lastTouchEnd <= 300) {
        event.preventDefault();
      }
      lastTouchEnd = now;
    },
    false
  );

  document.addEventListener("gesturestart", function (event) {
    event.preventDefault();
  });
})()