el-dialog侧边弹窗可横向拖拽改变宽度，并且存储到localStorage，刷新页面后依然是拖拽后的宽度

Vue.directive('dialogDrag', {
	inserted: function (el) {
		const dragDom = el.querySelector(".el-dialog");
		dragDom.style.cursor = "e-resize";
		const dialogHeader = el.querySelector('.el-dialog__header');
		dialogHeader.style.cursor = "auto";
		// 存储的宽度,需要id存储
		let dialogWidth = localStorage.getItem('dialogWidth') 
		let dialogWidthObj = {}
		if(dialogWidth && el.id) {
			dialogWidthObj = JSON.parse(dialogWidth)
			const sw = dialogWidthObj[el.id]
			if(sw) {
				dragDom.style.width = `${sw}px`
			}
		}
		dragDom.onmousedown = (e) => {
			// 鼠标按下，计算当前元素距离可视区的距离
			const disX = e.clientX
			const w = dragDom.clientWidth
			const minW = 300
			const maxW = document.body.clientWidth
			var nw
			document.onmousemove = function(e) {
				// 通过事件委托，计算移动的距离
				const l = e.clientX - disX
				// 改变当前元素宽度，不可超过最小最大值
				nw = w - l
				nw = nw < minW ? minW : nw
				nw = nw > maxW ? maxW : nw
				dragDom.style.width = `${nw}px`

				if(el.id) {
					dialogWidthObj[el.id] = nw
					localStorage.setItem('dialogWidth',JSON.stringify(dialogWidthObj)) 
				}
			}
	
			document.onmouseup = function(e) {
				document.onmousemove = null
				document.onmouseup = null
			}
		}
	},
	update: function (el) {
		const dialogBody = el.querySelector('.el-dialog__body');
		if(dialogBody) {
			dialogBody.style.margin = "0 20px";
			dialogBody.style.padding = "30px 0";
			dialogBody.style.cursor = "auto";
		}
	}
});

使用：在el-dialog 组件中绑定 v-dialogDrag 指令

<el-dialog
	v-dialogDrag
	id="addRoleDialog"
	:before-close="handleClose"
	:visible="dialogVisible"
	append-to-body
	title="添加角色"
	width="28%"
>
//.......
</el-dialog>

在这里插入图片描述