问题描述
我正在使用 web3 进行我的第一个 dapp 测试,我想这样做,如果尚未选择网络,MetaMask 将提示用户将网络更改为 Binance (BSC) 网络,就像这里一样:
如何触发这样的请求?
解决方法
我终于找到了答案:
await window.ethereum.request({
method: 'wallet_switchEthereumChain',params: [{ chainId: '0x61' }],// chainId must be in hexadecimal numbers
});
一个更全面的答案是检查是否安装了 MetaMask,是否安装了你的 Dapp 想要连接的链,如果没有安装它:
// Check if MetaMask is installed
// MetaMask injects the global API into window.ethereum
if (window.ethereum) {
try {
// check if the chain to connect to is installed
await window.ethereum.request({
method: 'wallet_switchEthereumChain',// chainId must be in hexadecimal numbers
});
} catch (error) {
// This error code indicates that the chain has not been added to MetaMask
// if it is not,then install it into the user MetaMask
if (error.code === 4902) {
try {
await window.ethereum.request({
method: 'wallet_addEthereumChain',params: [
{
chainId: '0x61',rpcUrl: 'https://data-seed-prebsc-1-s1.binance.org:8545/',},],});
} catch (addError) {
console.error(addError);
}
}
console.error(error);
}
} else {
// if no window.ethereum then MetaMask is not installed
alert('MetaMask is not installed. Please consider installing it: https://metamask.io/download.html');
}