html实现简单的目标树

<template>
    <div class="canvasBox"> 
        <!-- 父级的目标 -->
        <div v-if="objective.superObj.id" style="display:flex">
            <div class="objective_card_list">
                {{objective.superObj.name}}
            </div> 
            <div style="width:100px; height:40px; border-bottom:1px solid #d9d9d9"></div> 
        </div>
        <!-- 当前目标 -->
        <div>
            <div class="objective_card_list" style="background-color:#f0f8ff">
                {{objective.name}}
            </div>
        </div> 
        <!-- 子级目标 -->
        <div v-if="objective.subObj.length > 0">
            <div v-for="(subItem,subIndex) of objective.subObj" :key="subItem.id" style="display:flex">
                <!-- 只有一个子目标 -->
                <div v-if="subIndex==0 && objective.subObj.length == 1">
                    <div style="width:100px; height:40px; border-bottom:1px solid #d9d9d9"></div>
                </div>
                <!-- 多个子目标第一个目标 -->
                <div v-if="subIndex==0 && objective.subObj.length > 1">
                    <div style="width:100px; height:40px; border-bottom:1px solid #d9d9d9"></div>
                    <div style="width:50px; height:60px; margin-left:auto; border-left:1px solid #d9d9d9"></div>
                </div>
                <!-- 多个子目标中间部分的目标 --> 
                <div style="width:100px"  v-if="subIndex && subIndex != objective.subObj.length -1">
                    <div style="width:50px; height:40px; margin-left:auto; border-left:1px solid #d9d9d9; border-bottom:1px solid #d9d9d9;"></div>
                    <div style="width:50px; height:60px; margin-left:auto; border-left:1px solid #d9d9d9"></div>
                </div>
                <!-- 多个子目标中的最后一个目标 -->
                <div style="width:100px" v-if="subIndex && subIndex == objective.subObj.length -1"> 
                    <div style="width:50px; height:40px; margin-left:auto; border-bottom:1px solid #d9d9d9; border-left:1px solid #d9d9d9"></div>
                </div>
                <div class="objective_card_list">
                    {{subItem.name}}
                </div>
            </div>
        </div>
    </div>
</template>

<script>
export default {
    data(){
        return{
            objective:{
                name:'当前目标',
                superObj:{
                    id:'101',
                    name:'父级目标',
                },
                subObj:[
                    {
                        id:"001",
                        name:'第一个子目标'
                    },
                    {
                        id:"002",
                        name:'第二个子目标'
                    },
                    {
                        id:"003",
                        name:'第三个子目标'
                    },
                    {
                        id:"004",
                        name:'第四个子目标'
                    }
                ]
            }
        }
    }
}
</script>

<style>
.canvasBox{
    display: flex;
    justify-content: center;
    padding: 60px;
    min-height: 500px;
    border: 1px solid #000;
}
.objective_card_list{
    width: 200px;
    height: 80px;
    text-align: center;
    line-height: 80px;
    overflow: hidden;
    border: 1px solid #d9d9d9;
    border-radius: 2px;
    transition: ease all 0.5s;
    cursor: pointer; 
} 
</style>
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