jQuery是否具有dojo.hitch()的等效项? [英] does jquery have an equivalent of dojo.hitch()?

问题描述

请原谅我的无知，因为我对jquery不那么熟悉.是否有与 dojo.hitch()等效的东西?它返回一个保证在给定范围内执行的函数.

Forgive my ignorance as I am not as familiar with jquery. Is there an equivalent to dojo.hitch()? It returns a function that is guaranteed to be executed in the given scope.

-编辑- 根据要求，这是一个示例.我经常使用挂钩来确保回调在正确的对象内执行.例如，假设我有一个名为doSomethingAsync的实用程序方法，并向其传递了一个回调函数.即使没有使用Utility方法执行Ajax调用，我也可以确保使用Hitch可以在特定范围内执行该函数:

-- edit -- As requested, here is an example. I use hitch very frequently to ensure callbacks are executed within the right object. For example, let's say I have a utility method called doSomethingAsync and I pass it a callback function. With hitch, I can make sure the function is executed within a particular scope even if the utility method performs ajax calls and so forth:

expectedScopeObj = {
   flag: true,
   callback: function(){console.debug(this.flag);},
   main: function() {
     // without hitch the callback function would not find flag  
     core.util.doSomethingAsync(dojo.hitch(this, this.callback));
   }
}

没有障碍，回调函数可能会在不同的范围内执行，并且会抛出错误，并且未定义this.flag.但是，通过挂钩可以保证在execptedScopeObj中执行.

Without hitch, the callback function could possibly be executed in a different scope and an error would be thrown with this.flag being undefined. However, with hitch it is guaranteed to be executed within execptedScopeObj.

推荐答案

我知道已经回答了，但是没有正确回答.我相信 jQuery.proxy 是您要寻找的东西.

I know this has been answered, but not correctly. jQuery.proxy is what you are looking for I believe.

更新

很多年后，经过许多JavaScript工作之后，并且由于浏览器兼容性不再是一个问题，因此我剥离了jQuery的使用之后，我建议使用 @bobince建议.尽管这仍然是对原始问题的正确答案，但我还是不得不将人们引导到一种通用的解决方案，而不是依赖jQuery.

Many, many years later after lots of JavaScript work, and after stripping out my usage of jQuery since browser compatibility has become less of an issue, I would recommend using Function.prototype.bind over jQuery.proxy, as @bobince suggested. While this is still the correct answer to the original question, I feel obligated to direct people to a vanilla solution rather than relying on jQuery.

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