具体配置参考u-view官方,此处只使用，方便自己项目复用

<template>
	<view class="leave_cont">
		<view class="subNav">
			<view class="subNav-icon icon">
				<image src="../static/img/home/pickera-icon.png" mode=""></image>
			</view>

			<view class="subNav-tit">
				<u-select @click="show = true" :default-value="defaultValue" :mode="mode" v-model="show" :list="list" @confirm="confirm"
				 @cancel="cancel"></u-select>
				<view class="u-demo-result-line">电力类别：{{ result }}</view>
			</view>
			
			 <view class="subNav-icon icon2" @click="show = true">
				<image src="../static/img/admin/right.png" mode=""></image>
			</view>

		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				show: false,
				result: '尚未选择',
				defaultValue: [0],//默认选项
				mode: 'single-column', // single-column, mutil-column, mutil-column-auto
				list: [{
						value: '1',
						label: '有功功率'
					},
					{
						value: '2',
						label: '电流'
					},
					{
						value: '3',
						label: '相电压'
					},
					{
						value: '4',
						label: '线电压'
					},
					{
						value: '5',
						label: '频率'
					},
					{
						value: '6',
						label: '无功功率'
					},
					{
						value: '7',
						label: '视在功率'
					}
				]
			};
		},
	
		methods: {
			confirm(e) {
				this.result = '';
				e.map((val, index) => {
					// this.result += this.result == '' ? val.label : '-' + val.label;
					let result = val.label
					this.result += result;
				})
			},
			cancel(e) {
				console.log(e);
			}
		}
	}
</script>