是否可以向JQuery的Promise对象添加方法? [英] Is it possible to add methods to JQuery's promise object?

问题描述

我想向JQuery的promise对象添加catch方法，因此我不必每次都键入以下内容:

I want to add a catch method to JQuery's promise object so I don't have to type the following every time:

.then(null,function(data){
    // handle error
    return $.Deferred().resolve().promise();
});

此外，它将使阅读变得更容易.我将如何在JQuery 1.11中做到这一点?

Also, it'll make it easier to read. How would I do this in JQuery 1.11?

推荐答案

是的，可以，但是我强烈建议您不要这样做.而是使用适当的Promise库并吸收您的jQuery Promise；这样您就可以使用内置的库(并且是正确的).catch()方法-这样就可以省略return $.Deferred().resolve().promise();行.

Yes, it is possible, but I would strongly recommend not to do this. Rather use a proper promise library and assimilate your jQuery promises; so that you can use the libraries builtin (and correct) .catch() method - so that you can omit that return $.Deferred().resolve().promise(); line as well.

扩展jQuery Promise的问题在于它们不继承我们可以简单修改的​​原型，而是使用工厂模式(请阅读装饰它:

The problem with extending jQuery promises is that they don't inherit from a prototype which we could simply amend, but use a factory pattern (read the source). You'll need to decorate it:

jQuery.Deferred = (function($Deferred) {
    var Deferred = function(func) {
        var deferred = $Deferred(func),
            promise = deferred.promise();
        deferred.catch = promise.catch = function(fnFail) {
            return promise.then(null, fnFail);
        };
        return deferred;
    };
    return Deferred;
}(jQuery.Deferred));

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