通过iPhone和Android上的JavaScript检测手指滑动

简单的原始JS代码示例：

document.addEventListener('touchstart', handleTouchStart, false);        document.addEventListener('touchmove', handleTouchMove, false);var xDown = null; var yDown = null;function getTouches(evt) {  return evt.touches ||  // browser API         evt.originalEvent.touches; // jQuery}function handleTouchStart(evt) {    const firstTouch = getTouches(evt)[0];         xDown = firstTouch.clientX;         yDown = firstTouch.clientY;     };function handleTouchMove(evt) {    if ( ! xDown || ! yDown ) {        return;    }    var xUp = evt.touches[0].clientX;       var yUp = evt.touches[0].clientY;    var xDiff = xDown - xUp;    var yDiff = yDown - yUp;    if ( Math.abs( xDiff ) > Math.abs( yDiff ) ) {        if ( xDiff > 0 ) {          } else {         }     } else {        if ( yDiff > 0 ) {          } else {          }   }        xDown = null;    yDown = null; };

在Android上测试。