可以参考下面的示例，该示例是以动态token为例的：

(async () => {
let token = pm.variables.get("accessToken");
console.log("当前token：", token)
const getToken = async () => {
const res = await pm.sendRequest({
method: "post",
url: "http://192.168.31.88:42224/api/v1/login",
data: {
username: "user2",
password: "a123456"
}
})
if (res) return res.data.accessToken;
}

if (!token) {
console.log("未存在token，开始获取token")
token = await getToken().catch((err) => {
console.log("err", err)
});;
pm.variables.set("accessToken", token);
}

// 判断token是否有效
try {
const res = await pm.sendRequest({
method: "get",
url: "http://192.168.31.88:42224/api/v1/project/list",
headers: {
authorization: `Bearer ${token}`,
}
})
console.log("token有效",)
} catch (error) {
// 重新获取token
console.log("token已失效，开始重新获取", error)
token = await getToken().catch((err) => {
console.log("重新获取token失败", err)
});;
pm.variables.set("accessToken", token);
console.log("重新获取token成功", token)
}

// 使用token
pm.request.header.push({
key: "authorization",
value: `Bearer ${token}`,
});
})()