How to make sign tx for erc20 token transfer?

Question

How can I make an erc20 token transfer in node, I know to transfer eth is like this for using ethers. Lib:

let privateKey = "0x3141592653589793238462643383279502884197169399375105820974944592"
let wallet = new ethers.Wallet(privateKey)

console.log(wallet.address)
// "0x7357589f8e367c2C31F51242fB77B350A11830F3"

// All properties are optional
let transaction = {
    nonce: 0,
    gasLimit: 21000,
    gasPrice: utils.bigNumberify("20000000000"),

    to: "0x88a5C2d9919e46F883EB62F7b8Dd9d0CC45bc290",
    // ... or supports ENS names
    // to: "ricmoo.firefly.eth",

    value: utils.parseEther("1.0"),
    data: "0x",

    // 这可确保无法在不同网络上重复广播
    chainId: ethers.utils.getNetwork('homestead').chainId
}

let signPromise = wallet.sign(transaction)

signPromise.then((signedTransaction) => {

    console.log(signedTransaction);
    // "0xf86c808504a817c8008252089488a5c2d9919e46f883eb62f7b8dd9d0cc45bc2
    //    90880de0b6b3a76400008025a05e766fa4bbb395108dc250ec66c2f88355d240
    //    acdc47ab5dfaad46bcf63f2a34a05b2cb6290fd8ff801d07f6767df63c1c3da7
    //    a7b83b53cd6cea3d3075ef9597d5"

    // 现在可以将其发送到以太坊网络
    let provider = ethers.getDefaultProvider()
    provider.sendTransaction(signedTransaction).then((tx) => {

        console.log(tx);
        // {
        //    // These will match the above values (excluded properties are zero)
        //    "nonce", "gasLimit", "gasPrice", "to", "value", "data", "chainId"
        //
        //    // These will now be present
        //    "from", "hash", "r", "s", "v"
        //  }
        // Hash:
    });
})