// 获取所有挂单
function getAllPendingOrders(num) {
    var ret = exchanges[num].IO("api", "GET", "/fapi/v1/openOrders");
    var pending_orders = [];

    if (!ret || ret.length <= 0) {
        return null;
    }

    for (var i = 0; i < ret.length; i++) {
        var type = "";
        if (ret[i].stopPrice == "0") {