Get OK Futures Real Time Price Limit

$.GetLimit = function(currStr, contract) {
    var url = "https://www.okcoin.com/api/v1/future_price_limit.do?symbol=" + currStr + "_usd&contract_type=" + contract;
    var httpResp = HttpQuery(url);
    if (httpResp.indexOf("false") != -1) return null;
    var parsedResp;
    try {
        parsedResp = JSON.parse(httpResp);
    } catch (e) {
        return null;
    }
    return parsedResp;
};

function main() {
    var limit = $.GetLimit('btc', 'quarter'); // Get Bitcoin quarterly contract limit price
    Log(limit.high, limit.low); // Highest buy, lowest sell limit price
    limit = $.GetLimit('ltc', 'this_week'); // Get Litecoin weekly contract limit price
    Log(limit.high, limit.low); // Highest buy, lowest sell limit price
    limit = $.GetLimit('btc', 'next_week'); // Get Bitcoin next week contract limit price
    Log(limit.high, limit.low); // Highest buy, lowest sell limit price
    
}