vue操作dom元素的三种方法

methods:{
   this.$refs.addAlert.style.display = “block”;
}

<template>
	<div id="app">
		<div  class="index-box">
			<!--新增按钮-->
			<input type="button" id="DbManagement-addBtn" @click="showAddAlert" value="新增">
			<!--新增数据源弹框-->
			<div class="addDbSource-alert" ref="addAlert">
				<div class="addAlert-top">
					<!--添加数据源-->
					<input type="button" value="×" class="addAlert-close" @click="closeAddAlert">
				</div>
				<div class="addAlert-content">
					<div style="height: 1000px;"></div>
				</div>
			</div>
		</div>
	</div>
</template>
<script>
	export default {
		name: "Index",
		data(){
			return {
			}
		},
		methods:{
			// 点击新增按钮，弹出新增数据源的弹框
			showAddAlert(){
				this.$refs.addAlert.style.display = "block";
			},
			// 点击 × 关闭新增数据源的弹框
			closeAddAlert(){
				this.$refs.addAlert.style.display = "none";
			},
		},
		created(){
		}
	}
</script>
<style scoped>
	#app{
		width:100%;
		height:100%;
		overflow-y:auto;
	}
 	/* 容器 */
    .index-box{
        width: 100%;
        height: 100%;
        background: #212224;
        display: flex;
    }
    /* 添加数据源按钮 */
    #DbManagement-addBtn {
        width: 100px;
        height: 45px;
        border: none;
        border-radius: 10px;
        background: rgba(29, 211, 211, 1);
        box-shadow: 2px 2px 1px #014378;
        margin-left: 20px;
        margin-top: 17px;
        cursor: pointer;
        font-size: 20px;
    }
    /*新增数据源弹框*/
    .addDbSource-alert{
        position: fixed;
		top:0;left:0;right:0;bottom:0;
		margin:auto;
        width: 4rem;height: 4rem;
        background: #2b2c2f;
        display: none;
    }
    /*新增弹框头部*/
    .addAlert-top{
        width: 100%;
        height: 50px;
        background: #1dd3d3;
        line-height: 50px;
        font-size: 20px;
        box-sizing: border-box;
        padding-left: 20px;
    }
    /*新增弹框关闭*/
    .addAlert-close{
        background: #1dd3d3;
        border: none;
        font-size: 30px;
        cursor: pointer;
        float: right;
        margin-right: 20px;
        margin-top: 5px;
    }
    /*新增弹框内容部分*/
    .addAlert-content{
        width: 100%;
        box-sizing: border-box;
        padding: 0px 30px 20px;
    }
    /* 滚动条效果 */
    /* 设置滚动条的样式 */
    .addAlert-content::-webkit-scrollbar {
        width: 5px;
    }
    /* 滚动槽 */
    .addAlert-content::-webkit-scrollbar-track {
        /* -webkit-box-shadow: inset 0 0 6px  rgba(40, 42, 44, 1);
        border-radius: 10px; */
    }
    /* 滚动条滑块 */
    .addAlert-content::-webkit-scrollbar-thumb {
        border-radius: 10px;
        background: rgba(29, 211, 211, 1);
        /* -webkit-box-shadow: inset 0 0 6px rgba(29, 211, 211, 1); */
    }
    .addAlert-content::-webkit-scrollbar-thumb:window-inactive {
        background: rgba(29, 211, 211, 1);
    }
</style>