[未解决]ＪＳ ＢＵＴＴＯＮ 设定问题

程式内容　与股票相关
有两个栏位
下面两个按钮　为发送以及　清除
希望能在　栏位为空字串时　下方按钮　不可以使用　（ＤＩＳＡＢＬＥ）
栏位　有选择日期时　则　ＥＮＡＢＬＥ　按钮可使用
下面为ＣＯＤＥ　感觉合理　但不知为何跑不出来　希望有大大　可以帮解答　谢谢
问题出在　红色字那边＠＠
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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