前端vue项目中，经常会有弹框拖拽的需求，下面介绍常用方法：
1.如果你使用的是elementPlus插件的el-dialog组件,只需要增加draggable属性即可，代码如下：

<el-dialog
    v-model="showDiloag"
    width="500"
    draggable
 ></e--dialog>

2.如果不使用ele 的组件，自己写弹框，那么可以自定义指令，代码如下(vue3)：

drag.js文件：

const drag = {
  mounted(el, binding) {
    el.style.position = "absolute";
    const data = binding.value || { x: 0, y: 0, zIndex: 99999 };
    let { x, y, zIndex = 99999 } = data;
    el.style.left = x + "px";
    el.style.top = y + "px";
    el.style.zIndex = zIndex;
    let isDragging = false;
    let baseMousePosition = { x: 0, y: 0 };
    let dom = data.targetRef || document.getElementById(data.targetId) || el;
    dom.style.cursor = "move";
    const onDragStart = (e) => {
      if (e.button === 0) {
        isDragging = true;
        baseMousePosition.x = e.pageX;
        baseMousePosition.y = e.pageY;
        window.addEventListener("mousemove", onDraging);
      }
    };
    const onDragEnd = (e) => {
      isDragging = false;
      x = parseInt(el.style.left);
      y = parseInt(el.style.top);
      window.removeEventListener("mousemove", onDraging);
    };
    const onDraging = (e) => {
      if (isDragging) {
        el.style.left = e.pageX - baseMousePosition.x + x + "px";
        el.style.top = e.pageY - baseMousePosition.y + y + "px";
      }
    };
    dom.addEventListener("mousedown", onDragStart);
    window.addEventListener("mouseup", onDragEnd);
  },
};

const directives = {
  install: function (app) {
    app.directive('drag', drag)
  }
}
export default directives

vue文件使用：

<script setup>
import { ref } from "vue";

const dragRef = ref()
const dragOptions= ref({
  x: 100,
  y: 200,
  targetRef: dragRef,
})
</script>

<template>
	<div v-drag="dragOptions" class="dialog">
		<div class="dialog_header" ref="dragRef">弹框标题</div>
		<div class="dialog_content">弹框内容</div>
	</div>

<template>

这里的dragOptions就是配置项，x和y是弹框的初始位置的left和top值，targetRef的值是你希望鼠标在哪个dom元素可以拖拽，如果不传，就默认在整个弹框范围，都可以拖拽。