1.判断滑动的手势条件

  • 触发touchmove事件
  • 移动的超过一定的距离，如10px， 像滑动了1px，2px这类的距离太小，不能视为滑动
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .box{
            width: 200px;
            height: 200px;
            background-color: hotpink;
        }
    </style>
</head>
<body>
    <div class="box">

    </div>
</body>

<script>

    window.onload = function(){
        var bindSwiperEvent = function(dom, leftCallBack, rightCallback){
            // 判断手势的条件
            // 必须滑动 滑动距离超过10px
            var isMove = false;
            var startX = 0;
            var distanceX = 0;

            dom.addEventListener( 'touchstart', function(e){
                startX = e.touchs[0].clientX;
            })

            dom.addEventListener('touchmove', function(e){
                isMove = true;
                var moveX = e.touchs[0].clientX;
                distanceX = moveX - startX;
            })

            dom.addEventListener('touchend',function(e){
                if(isMove && Math.abs(distanceX >= 10)){
                    // 右滑动
                    if(distanceX>0){
                        rightCallback && rightCallback.call(this,e);
                    }
                    // 左滑动
                    else{
                        leftCallBack && leftCallBack.call(this,e);
                    }
                }
                // 重置参数
                isMove = false;
                startX = 0;
                distanceX = 0;
            })
        }

        bindSwiperEvent( document.querySelector('.box'), function(e){
            console.log('左滑动')
        }, function(e){
            console.log('右滑动')
        }  )
    }
</script>

</html>