改写统一API的参数

注意，统一API的大部分方法都可以接受一个可选的params参数，它是一个 关联数组（字典，默认为空），包含了你希望改写的参数。params的内容 是与特定交易所相关的，参考交易所的API文档了解其支持的字段和值。如果 你需要传入自定义设置或可选的参数，那么可以使用params字典。

JavaScript示例代码：

(async () => {

    const params = {
        'foo': 'bar',      // exchange-specific overrides in unified queries
        'Hello': 'World!', // see their docs for more details on parameter names
    }

    // the overrides go into the last argument to the unified call ↓ HERE
    const result = await exchange.fetchOrderBook (symbol, length, params)
}) ()

Python示例代码：

params = {
    'foo': 'bar',       # exchange-specific overrides in unified queries
    'Hello': 'World!',  # see their docs for more details on parameter names
}

# overrides go in the last argument to the unified call ↓ HERE
result = exchange.fetch_order_book(symbol, length, params)

PHP示例代码：

$params = array (
    'foo' => 'bar',       // exchange-specific overrides in unified queries
    'Hello' => 'World!',  // see their docs for more details on parameter names
}

// overrides go into the last argument to the unified call ↓ HERE
$result = $exchange->fetch_order_book ($symbol, $length, $params);