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detect-metamask
创建连接，并监听钱包切换

一、连接钱包，切换地址（监听地址切换），断开连接

1. 使用npm安装 @metamask/detect-provider在您的项目目录中：

npm i @metamask/detect-provider

import detectEthereumProvider from "@metamask/detect-provider";
async onLoad() {if (typeof window.ethereum !== "undefined") {console.log("MetaMask 已安装!");}this.provider = await detectEthereumProvider();this.provider.request({method: "eth_accounts"}).then(this.handleAccountsChanged).catch((err) => {console.error(err);});this.provider.on("accountsChanged", this.handleAccountsChanged);
},
methods: {// 这个方法，只在钱包APP内可以监听到地址切换，浏览器不行。handleAccountsChanged(accounts) {console.log('监听', accounts);if (accounts.length === 0) {console.log("请连接到MetaMask");} else if (accounts[0] !== this.address) {console.log('地址发生更换', this.address);this.address = accounts[0];}},// 连接钱包async getAccount() {// 1.向用户请求连接钱包，弹出钱包选择账户let res = await window.ethereum.request({"method": "wallet_requestPermissions","params": [{"eth_accounts": {}}]}).catch((err) => {// User rejected the request. （用户拒绝了请求。）console.log(err.message);});if(res){// 2.选择地址并确认let accounts = await this.provider.request({method: "eth_requestAccounts"}).catch((err) => {if (err.code === 4001) {console.log("请连接到MetaMask.");} else {console.error(err);}});this.address = accounts[0]; // 当前钱包地址}},// 关闭连接，仅适用于浏览器扩展。async closeAccount() {var res = await window.ethereum.request({"method": "wallet_revokePermissions","params": [{"eth_accounts": {}}]});this.address = ''console.log('连接已断开', res);},
}

实现的效果图：