transition-T 手机端滑动验证

<template>
    <div id="SlideBar" class="container">
        <div class="item" ref="slide" :style="slideStyle" @touchstart="start($event)" @touchmove="move($event)"
            @touchend="end($event)">
            <img src="../../../assets/newimage/vip/levelb1.png" alt="">
        </div>
        <div class="btn" ref="btn">
        </div>

    </div>
</template>

<script>
    export default {
        name: 'SlideBar',
        props: {

        },
        data() {
            return {
                // 屏幕总宽度
                clientWidth: document.body.clientWidth,
                flag: false,
                startX: 0,
                endX: 0,
                slideStyle: {
                    left: 0,
                    transition: 'none'
                }
            }
        },
        created: function() {
        },
        methods: {
            start(e) { //记录开始滑动屏幕的X轴的位置
                this.flag = true;
                this.startX = e.touches[0].clientX;
                console.log(e.touches[0].clientX)
                this.endX = this.$refs.slide.offsetLeft;
                console.log(this.$refs.slide.offsetLeft)
                this.slideStyle.transition = 'none';
            },
            move(e) {
                if (this.flag) {
                    // 处理鼠标移动的逻辑
                    var moveX = this.endX + (e.touches[0].clientX - this.startX); //计算滑动的距离
                    if (Math.abs(moveX) >= this.$refs.btn.offsetWidth && moveX < 0) { //判断滑动的距离是否大于class:btn的宽度
                        moveX = (Math.abs(moveX) - this.$refs.btn.offsetWidth) * 0.1; // 0.3阻力系数
                        this.slideStyle.left = -this.$refs.btn.offsetWidth - moveX + 'px';
                    } else if (moveX >= 0) { //滑动距离是否大于等于0
                        this.slideStyle.left = 0 + 'px'; //大于等于0让class:item等于0
                    } else {
                        this.slideStyle.left = moveX + 'px'; //小于0让class:item等于滑动的距离
                    }
                }
            },
            end(e) {
                if (this.flag) {
                    this.flag = false;
                    var moveX = e.changedTouches[0].clientX - this.startX; //计算滑动的距离
                    this.slideStyle.transition = 'left .3s';
                    var btnWidth = this.$refs.btn.offsetWidth; //class:btn的宽度
                    if (moveX < 0) {
                        if (Math.abs(moveX) >= btnWidth / 2 || Math.abs(this.$refs.slide.offsetLeft) >= this.$refs.btn
                            .offsetWidth) { //是否大于class:btn宽度的一半
                            this.slideStyle.left = -btnWidth + 'px'; //左滑超过class:btn宽度的一半就滑回去
                        } else if (Math.abs(moveX) < btnWidth / 2) { //小于class:btn宽度的一半
                            this.slideStyle.left = 0 + 'px'; //左滑没有超过class:btn宽度的一半回原位
                        }
                    } else if (moveX > 0 && this.endX != 0) {
                        if (Math.abs(moveX) >= btnWidth / 2) {
                            this.slideStyle.left = 0 + 'px'; //右滑超过class:btn宽度的一半就滑回去
                        } else if (Math.abs(moveX) < btnWidth / 2) {
                            this.slideStyle.left = -btnWidth + 'px'; //右滑没有超过class:btn宽度的一半回原位
                        }
                    }
                }
            }
        },
        mounted() {
            var _this = this;
            // 使用js的现代事件监听transition过渡结束
            this.$refs.slide.addEventListener('transitionend', function() {
                _this.endX = this.offsetLeft;
            })
        }
    }
</script>

<style lang="scss" scoped>







    .container {
        position: relative;
        display: flex;
        flex-direction: column;
        justify-content: flex-start;
        align-items: stretch;
        background-color: #f0f2f5;

        .btn {
            height: 100%;
            position: absolute;
            right: 0;
            top: 0;
            background: red;
            display: flex;
            background: #258ac5;
             4rem;
            height: 2rem;
        }

        .item {
            background: #b30000;
            padding: 0.2rem;
            display: flex;
            position: relative;
            background: #fff;
            z-index: 2;
            box-shadow: 0.02rem 0 0.05rem #ddd;
            height: 2rem;
        }
    }

    img {
         2rem;
        height: 2rem;
    }
</style>