问题描述
我发现自己使用一种奇怪的方式将回调函数添加到我的函数中,我想知道是否有一种更通用的方法来向函数添加回调,最好的情况是我会遇到一种情况,我的所有函数都会检查最后给定的函数作为函数的参数,如果是,则将其用作回调。
I found myself using a weird way to add callback functions to my functions and I was wondering if there is a more generic way to add callbacks to functions, best case I would have a situation where all of my functions check the last given param for being a function and if so use it as a callback.
这就是我过去的做法:
var myFunc = function( obj ) {
if ( arguments.length > 0 ) {
if ( _.util.typeofObj( arguments[arguments.length-1] ) === Function ) {
var callback = arguments[arguments.length-1];
}
}
// some code ...
if ( callback !== undefined ) {
callback();
}
};
var foo = myFunc( myObj, function(){
alert( 'Callback!' );
});
有什么建议吗?
推荐答案
如果你真的想,可以使用.cb原型扩展Function.prototype。类似于:
You could, if you really want to, extend Function.prototype with a .cb prototype. Something like:
Function.prototype.cb = function(cb){
var self = this;
return function(){
self.callback = cb || function(){};
self.apply(self, arguments);
}
}
然后您的代码将压缩为:
then your code would compress to:
var myFunc = function(obj){
// some code
this.callback(); // callback will always be defined
}
并且调用会略有变化:
myFunc.cb(function(){
// callback code
})(myObj);
只是一个想法。您可以根据需要制作语法。
Just an idea. You can make the syntax pretty much whatever you want.
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