市场缓冲强制重载

loadMarkets () / load_markets ()是一个有副作用的方法， 它会在exchange示例上保存市场数组。对每个交易所实例你只需要 调用一次。所有后续对此方法的调用都会返回本地保存的市场数组。

当载入交易市场后，你可以随时使用markets属性访问市场信息，这个 属性包含了一个以符号为键的市场关联数组。如果你需要强制重载市场 列表，只需要在调用时设置参数reload为true即可。

JavaScript示例代码：

(async () => {
    let kraken = new ccxt.kraken ({ verbose: true }) // log HTTP requests
    await kraken.load_markets () // request markets
    console.log (kraken.id, kraken.markets)    // output a full list of all loaded markets
    console.log (Object.keys (kraken.markets)) // output a short list of market symbols
    console.log (kraken.markets['BTC/USD'])    // output single market details
    await kraken.load_markets () // return a locally cached version, no reload
    let reloadedMarkets = await kraken.load_markets (true) // force HTTP reload = true
    console.log (reloadedMarkets['ETH/BTC'])
}) ()

Python示例代码：

poloniex = ccxt.poloniex({'verbose': True}) # log HTTP requests
poloniex.load_markets() # request markets
print(poloniex.id, poloniex.markets)   # output a full list of all loaded markets
print(list(poloniex.markets.keys())) # output a short list of market symbols
print(poloniex.markets['BTC/ETH'])     # output single market details
poloniex.load_markets() # return a locally cached version, no reload
reloadedMarkets = poloniex.load_markets(True) # force HTTP reload = True
print(reloadedMarkets['ETH/ZEC'])

PHP示例代码：

$bitfinex = new \ccxt\bitfinex (array ('verbose' => true)); // log HTTP requests
$bitfinex.load_markets (); // request markets
var_dump ($bitfinex->id, $bitfinex->markets); // output a full list of all loaded markets
var_dump (array_keys ($bitfinex->markets));   // output a short list of market symbols
var_dump ($bitfinex->markets['XRP/USD']);     // output single market details
$bitfinex->load_markets (); // return a locally cached version, no reload
$reloadedMarkets = $bitfinex->load_markets (true); // force HTTP reload = true
var_dump ($bitfinex->markets['XRP/BTC']);