实现功能：
切换，相当于tab

1、非组件代码：

<template>
	<div>
		<div class="tabStyle">
			<div v-for="(item,index) in tabTitle" :key="index" class="bordItemStyle" :class="choseIndex===index?'itemActiveStyle':'itemStyle'" @click="handleChose(index)">
				{{item}}
			</div>
		</div>
	</div>
</template>

<script>
	export default {
		name: "home",
		data() {
			return {
				choseIndex: 0,
				tabTitle:['近7天','近15天','近30天'],
			}
		},

		mounted() {

		},
		methods: {
			handleChose(index) {
				this.choseIndex = index;
			},

		}
	}
</script>

<style lang="scss" scoped>
	.tabStyle {
		display: flex;

		.itemStyle {
			background-color: #ffffff;
		}

		.itemActiveStyle {
			color: #ffffff;
			background-color: #025DF4;
		}

		.itemStyle,
		.itemActiveStyle {
			padding: 8px 20px;
			cursor: pointer;
		}

		.bordItemStyle {
			border-top: 1px solid rgb(220, 223, 230);
			border-bottom: 1px solid rgb(220, 223, 230);
			border-left: 1px solid rgb(220, 223, 230);

			&:last-child {
				border-right: 1px solid rgb(220, 223, 230);
			}
		}
	}
</style>

2、转换为组件代码
组件：文件src/components/TabBlock/index.vue
有两个要传递的参数，选项名tabTitle,激活的选项索引activeIndex.还有一个要传递的事件handleChange，该事件有一个参数index。

<template>
	<div>
		<div class="tabStyle">
			<div v-for="(item,index) in tabTitle" :key="index" class="bordItemStyle" :class="activeIndex===index?'itemActiveStyle':'itemStyle'" @click="$emit('handleChange',index)">
				{{item}}
			</div>
		</div>
	</div>
</template>

<script>
	export default {
		name: "TabBlock",
		props: {
			tabTitle: {
				type: Array,
				default: ''
			},
			activeIndex: {
				type: Number,
				default: ''
			},
		},
		data() {
			return {
			}
		},

		mounted() {

		},
		methods: {

		}
	}
</script>

<style lang="scss" scoped>
	.tabStyle {
		display: flex;

		.itemStyle {
			background-color: #ffffff;
		}

		.itemActiveStyle {
			color: #ffffff;
			background-color: #025DF4;
		}

		.itemStyle,
		.itemActiveStyle {
			padding: 8px 20px;
			cursor: pointer;
		}

		.bordItemStyle {
			border-top: 1px solid rgb(220, 223, 230);
			border-bottom: 1px solid rgb(220, 223, 230);
			border-left: 1px solid rgb(220, 223, 230);

			&:last-child {
				border-right: 1px solid rgb(220, 223, 230);
			}
		}
	}
</style>

调用组件的文件

<template>
	<div>
		<TabBlock :tabTitle="titles" :activeIndex="choseIndex" @handleChange="handleChose"></TabBlock>
	</div>
</template>

<script>
	import TabBlock from '@/components/TabBlock/index.vue'
	export default {
		name: "home",
		components:{
			TabBlock
		},
		data() {
			return {
				titles:['近7天','近15天','近30天'],
				choseIndex:0,
			}
		},

		mounted() {

		},
		methods: {
			handleChose(index){
				this.choseIndex = index;
				console.log("选中的索引",this.choseIndex)
				console.log("选中的名称",this.titles[this.choseIndex])
			}

		}
	}
</script>

<style lang="scss" scoped>
	
</style>

效果：