uniapp 小程序悬浮球效果

之前查资料有很多虚浮球效果，拖动时后面的背景也跟着移动。后来使用@touchmove.stop.prevent修饰符解决问题。

也根据缓存实现了，悬浮球全局调用，位置是前一个页面移动的位置。

<template>
    <view class="holdon" @touchstart="drag_start" @touchmove.stop.prevent="drag_hmove" @click.capture="toAdUrl">
        <image class="ball"
            :style="'left:'+(moveX == 0 & x>0? x+'%':moveX+'px')+';top:'+(moveY == 0 & y>0? y+'%':moveY+'px')"
            :src="imgUrl" mode="aspectFit">
        </image>
    </view>
</template>
<script>
    export default {
        props: {
            x: {
                type: Number,
                default: 0
            },
            y: {
                type: Number,
                default: 0
            },
            image: {
                type: String,
                default: ''
            }
        },
        data() {
            return {
                start: [0, 0],
                moveY: 200,//起始y坐标
                moveX: 10,//起始X坐标
                windowWidth: '',
                windowHeight: '',
                imgUrl: ""  //img 地址
            }
        },
        mounted() {
            let location = uni.getStorageSync('ball-location');
            if (location.x) {
                this.moveX = location.x
            }
            if (location.y) {
                this.moveY = location.y
            }
            const {
                windowWidth,
                windowHeight
            } = uni.getSystemInfoSync();
            this.windowWidth = windowWidth
            this.windowHeight = windowHeight
        },
        methods: {
            toAdUrl() {
            },
            drag_start(event) {
                this.start[0] = event.touches[0].clientX - event.target.offsetLeft;
                this.start[1] = event.touches[0].clientY - event.target.offsetTop;
            },
            drag_hmove(event) {
                let tag = event.touches;
                if (tag[0].clientX < 0) {
                    tag[0].clientX = 0
                }
                if (tag[0].clientY < 0) {
                    tag[0].clientY = 0
                }
                if (tag[0].clientX > this.windowWidth) {
                    tag[0].clientX = this.windowWidth
                }
                if (tag[0].clientY > this.windowHeight) {
                    tag[0].clientY = this.windowHeight
                }
                this.moveX = tag[0].clientX - this.start[0];
                this.moveY = tag[0].clientY - this.start[1];
                let location = {
                    x: this.moveX,
                    y: this.moveY
                };
                //将悬浮球 存缓存 其他页面展示 也在相同位置
                uni.setStorageSync('ball-location', location);
            }
        }
    }
</script>

<style lang="scss" scoped>
    .holdon {
         100%;
        height: 100%;
    }

    .ball {
         120rpx;
        height: 120rpx;
        border-radius: 50%;
        color: #fff;
        font-size: 30upx;
        display: flex;
        justify-content: center;
        align-items: center;
        position: fixed !important;
        z-index: 1000000;
    }
</style>

好了希望能帮助你。