我正在实现模块模式,我想公开一个事件函数 这是代码:
var module = (function(){
var self = {},
cb = $(":checkbox");
cb.on("change",/* self.OnChange */ ); // ???
return self;
}());
module.OnChange(callbackFunction);
function callbackFunction(event){
//do staff
}
那么,关于如何访问OnChange'callbackFunction'的任何想法?
或者使用模块模式更好的方法吗?
答案 0 :(得分:2)
我经常在我的modules / plugins / libraries中使用这个模式:
var borrow = function( obj, funcName, funcArg ){
return function(){
/// convert arguments to array
var args = Array.prototype.slice.call( arguments );
/// add in our fixed arg 'change'
args.unshift( funcArg );
/// execute the function
return obj[funcName].apply( obj, args );
}
}
self.change = borrow( cb, 'on', 'change' );
你可以在你的构造函数之外表示:
module.change( callbackFunction );
这基本上具有直接借用jQuery函数的效果,但是使用您选择的特定元素包装它。上面将直接将您的事件监听器传递给复选框,就像您直接输入以下内容一样:
cb.on( 'change', callbackFunction );
您可以改进上述内容以接受多个固定参数,如下所示:
var borrow = function( obj, funcName ){
/// convert arguments to array
var args1 = Array.prototype.slice.call( arguments );
/// remove the first two args (obj & funcName)
/// which means we now have an array of left over arguments
/// we'll treat these as 'fixed' and always passed to the
/// 'borrowed' function.
args1.shift(); args1.shift();
/// return a closure containing our 'borrowed' function
return function(){
/// convert arguments to array
var args2 = Array.prototype.slice.call( arguments );
/// create a new array combined from the fixed args and the variable ones
var args = args1.concat( args2 );
/// execute the function
return obj[funcName].apply( obj, args );
}
}
进一步改进(摆脱转变)会是这样的:
var borrow = function( obj, funcName ){
/// convert arguments to array and remove first two arguments
var args1 = Array.prototype.slice.call( arguments, 2 );
/// return a closure containing our 'borrowed' function
return function(){
/// convert arguments to array
var args2 = Array.prototype.slice.call( arguments );
/// create a new array combined from the fixed args and the variable ones
var args = args1.concat( args2 );
/// execute the function
return obj[funcName].apply( obj, args );
}
}
答案 1 :(得分:0)
我认为你正在制造一些混乱
var module = (function(){
// here this points to the window object
var self = this,
cb = $(":checkbox");
cb.on("change",/* self.OnChange */ ); // ???
// here you are returning the window object
return self;
}());
//since the function was instantaneous, here you are calling onChange() on the window object
module.OnChange(callbackFunction);
function callbackFunction(event){
//do staff
}
你究竟想做什么?