js模擬iphone手勢操做（拖拽、自動停靠）

時間 2019-11-06

原文原文鏈接

注：瀏覽器f12，選擇移動方式查看。html

<!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;
            touch-action: none;
        }

        html,
        body {
            width: 100%;
            height: 100%;
        }

        #div1 {
            width: 100px;
            height: 100px;
            background: cyan;
            position: absolute;

            bottom: 200px;
            right: 100px;
        }
    </style>
</head>

<body>
    <div id="div1"></div>
</body>

</html>
<script>
    window.onload = function () {
        // var moveNode = document.querySelector(".cus");
        // moveNode.style.transform = 'translateX(400px)';

        var div1 = document.querySelector("#div1");
        //限制最大寬高，不讓滑塊出去
        debugger
        var maxW = document.body.clientWidth - div1.offsetWidth;
        var maxH = document.body.clientHeight - div1.offsetHeight - 100;
        var moveDirection = 0; //自動移動方向：+ 右移：- 左移
        var moveDistance = 100; //自動移動距離
        //手指觸摸開始，記錄div的初始位置
        div1.addEventListener('touchstart', function (e) {
            
            // if(div1.style.transition != ''){
            //     div1.style.transition = '';
            //     div1.style.transform = '';

            //     let direc = moveDirection == '+' ? '-' : '+';
            //     direc += moveDistance - 0;
            //     div1.style.left = ((div1.style.left + '').replace(/px/, '') - 0 + parseFloat(direc)) + 'px';
            // }
            

            var ev = e || window.event;
            var touch = ev.targetTouches[0];

            oL = touch.clientX - div1.offsetLeft;
            oT = touch.clientY - div1.offsetTop;
            document.addEventListener("touchmove", defaultEvent, false);
        });
        //觸摸中的，位置記錄
        div1.addEventListener('touchmove', function (e) {
            var ev = e || window.event;
            var touch = ev.targetTouches[0];
            var oLeft = touch.clientX - oL;
            var oTop = touch.clientY - oT;
            if (oLeft < 0) {
                oLeft = 0;
            } else if (oLeft >= maxW) {
                oLeft = maxW;
            }
            if (oTop < 0) {
                oTop = 0;
            } else if (oTop >= maxH) {
                oTop = maxH;
            }
            div1.style.opacity = '0.2'
            div1.style.left = oLeft + 'px';
            div1.style.top = oTop + 'px';
        });
        //觸摸結束時的處理
        div1.addEventListener('touchend', function () {
            div1.style.opacity = '1'
            moveDirection = div1.style.left.replace(/px/, '') - 0 + div1.offsetWidth / 2 > document.body.clientWidth / 2 ? '+' : '-';
            moveDistance = moveDistance;

            if(moveDirection == '+'){
                moveDistance = document.body.clientWidth - div1.style.left.replace(/px/, '') - div1.offsetWidth;
            }else{
                moveDistance = div1.style.left.replace(/px/, '')
            }

            if(moveDistance > 0){
                div1.style.transition = 'all .5s';
                div1.style.transform = 'translateX(' + moveDirection + moveDistance + 'px)';
                setTimeout(function() {
                    div1.style.left = div1.style.left.replace(/px/, '') - 0 + (moveDirection == '-' ? -moveDistance : moveDistance) + 'px'
                    div1.style.transition = '';
                    div1.style.transform = '';
                }, 500)
            }

            document.removeEventListener("touchmove", defaultEvent);
        });
        //阻止默認事件
        function defaultEvent(e) {
            e.preventDefault();
        }

        // var ele = document.querySelector(".father");
        // left_scroll(ele);
    }


</script>

效果圖：
瀏覽器