先看代码最后看配置

<template>
	<view class="content">
		<button type="primary" @tap="tapOpen">打开APP</button>
	</view>
</template>

<script>
	export default {
		methods: {
			tapOpen() {
				let u = navigator.userAgent;
				var isWeixin = u.toLowerCase().indexOf('micromessenger') !== -1; // 微信内
				if (isWeixin) {
					alert('请在浏览器中打开')
					return false;
				}
				const platform = uni.getSystemInfoSync().platform;
				if (platform === 'ios') {
					this.ios()
				}
				if (platform === 'android') {
					this.android()
				}
			},

			ios() {
				uni.showLoading({
					title: '加载中...'
				});
				const currentTime = +(new Date());
				window.location.href = "cn.nftmall"; //找ios工程师要 UrlSchemes
				//启动间隔20ms运行的定时器，并检测累计消耗时间是否超过3000ms，超过则结束
				let _count = 0,
					timer;
				timer = setInterval(function() {
					_count++;
					const endTime = +(new Date()) - currentTime;
					if (_count >= 100 || endTime > 3000) {
						uni.hideLoading()
						clearInterval(timer);
						let hidden = window.document.hidden || window.document.mozHidden || window.document
							.msHidden || window.document.webkitHidden;
						if (typeof hidden == "undefined" || hidden == false) {
							//App store下载地址
							window.location.href = "https://www.baidu"; //下载地址 可以直接跳转到appstore的
						}
					}
				}, 20);
			},
			android() {
				uni.showLoading({
					title: '加载中...'
				});
				const currentTime = new Date().getTime();
				window.location.href = "nftmall://"; //找android工程师要 UrlSchemes
				// 启动间隔20ms运行的定时器，并检测累计消耗时间是否超过2000ms,超时则结束
				let _count = 0,
					timer;
				timer = setInterval(() => {
					_count++;
					const endTime = new Date().getTime() - currentTime;
					if (_count >= 200 || endTime > 5000) {
						uni.hideLoading()
						clearInterval(timer);
						let hidden = window.document.hidden || window.document.mozHidden || window.document
							.msHidden || window.document.webkitHidden;
						if (typeof hidden == "undefined" || hidden == false) {
							//App store下载地址
							window.location.href = "https://www.baidu"; //下载地址
						}
					}
				}, 20)
			}
		}
	}
</script>

<style>

</style>

我们打开manifest.json-源码视图-app-plus-android下配置"schemes" : "app" // app可随意

ios下配置

"urltypes" : [
                    {
                        "urlidentifier" : "cn.nftmall",
                        "urlschemes" : [ "nftmall" ]
                    }
                ],
				"urlschemewhitelist": [ "nftmall" ]

最后完整配置流程上图

 以上有所不理解可以小程序联系我