[javascript] 傳遞陣列給Xajax

var params = new Array(4); //建立幾筆陣列
params["wap_id"] = $F("wap_id");
params["mem_promo_id"] = $F("selected_mem_promo_id");
params["start_time"] = $F("promo_start_time");
params["end_time"] = $F("promo_end_time");
params["total_fee"] = 0;

xajax_exe_func('pay_with_promotion', params);