ios10及以上Safari无法禁止缩放的问题

js
export function disableSafariScalable() {
  // 阻止双击放大
  let ua =navigator.userAgent;
  let isSafariBrowser = /Safari/.test(ua) && !/Chrome/.test(ua);
  if(isSafariBrowser){
    let lastTouchEnd = 0;
    document.addEventListener('touchstart', function(event) {
      if (event.touches.length > 1) {
        event.preventDefault();
      }
    });
    document.addEventListener('touchend', function(event) {
      let 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();
    });
  }
}