解决ios下双击触发页面滚动问题

// Prevent web page from scrolling when double tap
// 阻止页面在ios系统上点击触发页面滚动

let agent = navigator.userAgent.toLowerCase();
let iLastTouch = null;
if (agent.indexOf('iphone') >= 0 || agent.indexOf('ipad') >= 0) {
  document.body.addEventListener('touchend', function (event) {
    let a = new Date().getTime();
    iLastTouch = iLastTouch || a + 1;
    let c = a - iLastTouch;
    if (c < 500 && c > 0) {
      event.preventDefault();
      return false;
    }
    iLastTouch = a;
  }, false);
};