JavaScript重载回调 [英] JavaScript overloading with a callback

问题描述

按照此问题中推荐的模式，我们有类似的东西到：

Following the pattern recommended in this question, where we have something akin to:

function foo(a, b, opts) {

}

foo(1, 2, {"method":"add"});
foo(3, 4, {"test":"equals", "bar":"tree"});

那么如何将回调包含为最终参数呢？我有函数 foo（），应该能够处理两个：

How would one then include a callback as the final parameter? I have function foo() that should be able to handle both of:

foo(x, y, function() {
  // do stuff
});

和

foo(x, y, z, function() {
  // do stuff
});

有任何建议吗？

推荐答案

结束使用以下解决方案：

Ended up going with the following solution:

foo(args) {}

foo({"x":"add", "callback": function() {
  // do stuff
}});


foo({"x":"equals", "y":"tree", "callback": function() {
  // do stuff
}});

然后只需检查最后一个参数值是否为函数，ala @ PaulP.RO' s的解决方案：

And then simply checking to see if the last arguments value is a function, ala @PaulP.R.O.'s solution above:

if((arguments.length > 1) && (typeof arguments[arguments.length - 1] === 'function')) {
  var callback = arguments[arguments.length - 1];
}

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