[未解決]ＪＳ ＢＵＴＴＯＮ 設定問題

程式內容　與股票相關
有兩個欄位
下面兩個按鈕　為發送以及　清除
希望能在　欄位為空字串時　下方按鈕　不可以使用　（ＤＩＳＡＢＬＥ）
欄位　有選擇日期時　則　ＥＮＡＢＬＥ　按鈕可使用
下面為ＣＯＤＥ　感覺合理　但不知為何跑不出來　希望有大大　可以幫解答　謝謝
問題出在　紅色字那邊＠＠
var mediator = ( function() {

// Storage for our topics/events
var channels = {};

// Subscribe to an event, supply a callback to be executed
// when that event is broadcast
var subscribe = function(channel, fn) {
if (!channels)
channels = [];
channels.push({
context : this,
callback : fn
});
return this;
};

// Publish/broadcast an event to the rest of the application
var publish = function(channel) {
if (!channels)
return false;
var args = Array.prototype.slice.call(arguments, 1);
for (var i = 0, l = channels.length; i < l; i++) {
var subscription = channels;
subscription.callback.apply(subscription.context, args);
}
return this;
};

return {
publish : publish,
subscribe : subscribe,
installTo : function(obj) {
obj.subscribe = subscribe;
obj.publish = publish;
}
};
}());

var ..

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