处理短信时，用hash表 来替换if else
? ? 在写处理短信的时候，要根据短信的内容来判断是报名短信和竞价短信时候，要到一些 if else， 可以用hash表的形式来替换掉这些代码。
if(message.content.substring(0, 2).toUpperCase() == "BM") { process_activity_sign_up_message() } else if (message.content.substring(0, 2).toUpperCase() == "JJ") { process_bid_sign_up_message() } else { prompt_message_format() }? ?下面用hash的形式来替换一下：
fore_two_string = message.content.substring(0, 2).toUpperCase() judge_message()function judge_message() { var judge_message = { BM: function() { process_activity_sign_up_message() }, JJ: function() { process_bid_sign_up_message() } } if(judge_message[fore_two_string]) { judge_message[fore_two_string]() return } prompt_message_format()}? ? 根据活动状态来处理短信：
judge_activity_status()function judge_activity_status() { var status = ActivityInfo.get_starting_activity() if(status == "un_start") { console.log("活动报名还未开始, 请稍后再试。") return } if(status == "start") { process_message_when_activity_status_start() return } if(status == "end") { console.log("抱歉，活动报名已经结束。") }? ? 用hash 来替换：
judge_activity_status()function judge_activity_status() { var judge_activity_status = { un_start: function() { console.log("活动报名还未开始, 请稍后再试。") }, end: function() { console.log("抱歉，活动报名已经结束。") }, start: function() { process_message_when_activity_status_start() } } judge_activity_status[ActivityInfo.get_starting_activity().status]()}? ? 不知道hash表的key时，如何取value值。在统计竞价各价钱的人数时：
var group_bid_sign_up_infos_by_price = _.groupBy(bid_sign_up_infos, function(bid_sign_up_info) { return bid_sign_up_info.price }) var price_counts = [ ]_.map(group_bid_sign_up_infos_by_price, function(value, key) { price_counts.push({price: key, count: value.length})})return price_counts? ? 用Underscope的_.groupBy来对竞价进行按price分组，再_.map来遍历分组后产生的hash表，然后对它进行新的数据封装。也可以用
for(key in group_bid_sign_up_infos_by_price) { price_counts.push({price: key, count: group_bid_sign_up_infos_by_price[key].length})}