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We oftentimes assume that "native" APIs within the browser are fast -- at least faster than shims we create or have been using. I was surprised to recently read this StackOverflow thread which asserts that Function.prototype.bind is much slower than what you can shim. The thread cites JS Perf links (which unfortunately don't work at the moment) but assuming the statements about speed are correct, let's check out how we can create our own bind function.
我们通常会假设浏览器中的“本机” API速度很快-至少比我们创建或一直使用的垫片更快。 我最近读了这个StackOverflow线程感到惊讶， 该线程断言Function.prototype.bind比您可以填充的要慢得多。 该线程引用了JS Perf链接(不幸的是，目前暂时不起作用)，但是假设有关速度的语句是正确的，让我们检查一下如何创建自己的bind函数。
Creating a basic bind function is incredibly easy, as the aforementioned provided:
如前所述，创建基本bind函数非常简单：
function bind (fn, ctx) { return function bound () { return fn.apply(ctx, arguments); }; } // Usage: bind(this.someFunction, this);This is the simplest possible bind function but it doesn't accommodate for additional arguments you can provide to bind, which is why a more complete function is more complicated:
这是可能的最简单的bind函数，但不能容纳您可以提供给bind其他参数，这就是为什么更完整的函数更复杂的原因：
function bind (fn, ctx/* , arg1, arg2 */) { return (function (prependedArgs) { return function bound () { // Concat the bound function arguments with those passed to original bind var args = prependedArgs.concat(Array.prototype.slice.call(arguments, 0)); return fn.apply(ctx, args); }; })(Array.prototype.slice.call(arguments, 2)); // Usage // anotherArg is first arg to onClick, then the event bind(this.onClick, this, anotherArg);This more complete method merges the passed-in arguments with the arguments provided to the individual function call (an Event, for example, if bind was used on an click event).
这更完整的方法合并传入的与提供给各个功能调用的参数(参数的Event ，例如，如果bind了上使用click事件)。
I cannot tell you with any certainty that Function.prototype.bind is in fact super slow, and if so, it's across every browser. It is interesting, however, to explore these native API speeds in an effort to make our apps as fast as possible.
我无法肯定地告诉您Function.prototype.bind实际上超级慢，如果是这样，它将遍历所有浏览器。 但是，探索这些本机API的速度以使我们的应用程序尽可能快地运行很有趣。
Know more about bind speed? Please share!
进一步了解绑定速度？ 请分享！
翻译自: https://davidwalsh.name/javascript-bind
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