vue3+ts实现拖拽功能

<template>
  <div class="about">
    <h1>拖拽demo</h1>
    <p id="drag"></p>
  </div>
</template>
<script lang="ts">
import { reactive, toRefs, onMounted } from "vue";
export default {
  name: "about",
  setup() {
    const data = reactive({});

    onMounted(() => {
      const el = document.getElementById("drag");
      useMove(el);
    });

    const datas = toRefs(data);
    return {
      ...datas,
    };
    // 可拖拽组件：pc和Mobile
function useMove(el: any) {
    el.style.position = 'fixed';
    let offsetX: number, offsetY: number, oL: number, oT: number, oLeft: number, oTop: number;
    const browser = {
        versions: function () {
            const u = navigator.userAgent;
            return {
                mobile: !!u.match(/AppleWebKit.*Mobile.*/), //判断设备
                //  ..... 其他设备信息
            };
        }(),
    }
    if (!browser.versions.mobile) {//Pc
        if (el != null) {
            el.addEventListener('mousedown', function (event: any) {
                if (event.button == 0 && el != null) {
                    const lexObj: any = getComputedStyle(el);
                    offsetX = event.pageX - el.offsetLeft + parseInt(lexObj['margin-left']);
                    offsetY = event.pageY - el.offsetTop + parseInt(lexObj['margin-right']);
                    const move = function (event: any) {
                        if (el != null) {
                            let x = event.pageX - offsetX;
                            let y = event.pageY - offsetY;
                            if (x < 0) {
                                x = 0;
                            } else if (x > document.documentElement.clientWidth - el.offsetWidth) {
                                x = document.documentElement.clientWidth - el.offsetWidth
                            }
                            if (y < 0) {
                                y = 0;
                            } else if (y > document.documentElement.clientHeight - el.offsetHeight) {
                                y = document.documentElement.clientHeight - el.offsetHeight
                            }
                            el.style.left = x + 'px';
                            el.style.top = y + 'px';
                        }
                        return false;
                    }
                    document.addEventListener('mousemove', move);
                    const stop = function () {
                        document.removeEventListener('mousemove', move);
                        document.removeEventListener('mouseup', stop);
                    }
                    document.addEventListener('mouseup', stop);
                }
                return false;
            });
        }
    } else { //Mobile
        if (el != null) {
            const maxW = document.body.clientWidth - el.offsetWidth;
            const maxH = document.body.clientHeight - el.offsetHeight;
            const defaultEvent = function (e: any) {
                e.preventDefault();
            }
            el.addEventListener('touchstart', function (e: any) {
                const ev = e || window.event;
                const touch = ev.targetTouches[0];
                oL = touch.clientX - el.offsetLeft;
                oT = touch.clientY - el.offsetTop;
                document.addEventListener("touchmove", defaultEvent, false);
                el.addEventListener('touchmove', function (e: any) {
                    const ev = e || window.event;
                    const touch = ev.targetTouches[0];
                    oLeft = touch.clientX - oL;
                    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;
                    }
                    el.style.left = oLeft + 'px';
                    el.style.top = oTop + 'px';
                });
                el.addEventListener('touchend', function () {
                    document.removeEventListener("touchmove", defaultEvent);
                });
            });
        }
    }
}
  },
};
</script>
<style scoped>
.about{
  width: 100%;
  height: 100%;
}
p {
  width: 100px;
  height: 100px;
  background: red;
  margin: 0;
}
</style>