JavaScript对象方法链接：有用吗？ [英] JavaScript Object Method Chaining: useful?

问题描述

所以...在JavaScript中乱搞一个对我来说很新的想法，让Object的方法返回它们是方法的Object;这导致了可链接性。我的问题是：这怎么有用？我把它扔在一起测试基本工作：

So... messing around in JavaScript with an idea that's new to me, having methods of an Object return the Object of which they are methods; this then leads to chainability. My question, then: how can this be useful? I threw this together to test the fundamental workings:

<script>
MathChain = function()
 {
    this.pass = function()
     {
        this.multiply = eval(arguments.join('*'));
        this.add = eval(arguments.join('+'));
        return this;
     }
 }

m = new MathChain().pass(5, 10, 20).multiply; // 1000
a = new MathChain().pass(5, 10, 20).add;      // 35
</script>

这显然不是一个使用这个概念的恶毒有效的实例，所以你能指点我确实做得恰到好处（除了jQuery之外）？

That's obviously not a viciously efficient instance in which one would use this concept, so could you point me to something that does do so properly (aside from jQuery, please)?

推荐答案

嗯，这里有一个不太现实的世界例如，但我想你会明白这个想法。如果允许您对对象执行许多不同的操作，并提供方便。

Well, here is a not very real-world applicable example, but I think you'll get the idea. If allows you to do a number of different operations on an object, and provides convenience.

var truck = function() {

    this.turnLeft = function {

       // turn left
       return this;

    }

    this.turnRight = function {

       // turn right
       return this;

    }

    this.goReallyFast = function {

       // go fast!
       return this;

    }

};

// My get-away plan
var myTruck = new truck();
myTruck.turnLeft().turnRight().goReallyFast();

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