属性比方法快吗?需要理由 [英] Property is faster than method? Need reason for it

问题描述

当我用这个谷歌搜索这个问题时，一个人给出的答案是属性比方法快，并给出了size()和length的一个示例.

As I google this question so one person give answer that property is faster than method and give one example of size() and length.

他说长度比大小快，因为长度是属性.你能告诉我这是正确的吗?或者，如果您能举个例子，那对我来说将是很棒的.

He said length is faster than size because length is property. Can you please let me know is it correct ? Or If you will give example then it will be great for me.

推荐答案

size内部调用该长度

//http://code.jquery.com/jquery-latest.js
// The number of elements contained in the matched element set
        size: function() {
                return this.length;
        },

因此，如果您使用的是长度，则可以避免一个额外的方法调用. Jquery文档说:

So if you are using length then you are avoiding one extra method call. The Jquery docs says:

.size()方法在功能上等效于.length属性； 但是，首选 .length属性，因为它没有 函数调用的开销.

The .size() method is functionally equivalent to the .length property; however, the .length property is preferred because it does not have the overhead of a function call.

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