解决ios 双指缩放、双击放大、移动端兼容性问题

window.onload = function () {
  // 阻止双击放大 
  var lastTouchEnd = 0;
  document.addEventListener('touchstart', function (event) {
    if (event.touches.length > 1) {
      event.preventDefault();
    }
  });
  document.addEventListener('touchend', function (event) {
    var now = (new Date()).getTime();
    if (now - lastTouchEnd <= 300) {
      event.preventDefault();
    }
    lastTouchEnd = now;
  }, false);
  // 阻止双指放大 
  document.addEventListener('gesturestart', function (event) {
    event.preventDefault();
  });
}

document.body.addEventListener('touchmove', function (e) {
  e.preventDefault(); //阻止默认的处理方式(阻止下拉滑动的效果)
}, {
  passive: false
});