自研jQuery插件:深化理解与重复造轮子的实践

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资源摘要信息:"Re-inventing-the-wheel:自己用的jQuery插件,其中的大部分应该是前辈们已经写过的,自己重写一遍来加深对插件的理解" ### 知识点概述: #### 1. jQuery插件开发基础 - **jQuery的定义与作用**:jQuery是一个快速、小巧、功能丰富的JavaScript库,它简化了HTML文档遍历、事件处理、动画和Ajax交互等操作。 - **插件的概念**:jQuery插件是对jQuery库功能的扩展,通过自定义的方法来增强jQuery的功能,插件可以提供额外的UI组件,或是增加一些特定的功能。 - **插件开发原理**:一个jQuery插件通常是定义为一个或多个函数,然后将这些函数添加到jQuery的原型($.fn)上,从而可以链式调用。 #### 2. 重写插件的目的与价值 - **加深理解**:通过重写现有的jQuery插件,开发者可以从零开始构建插件,这个过程中需要深入理解插件的工作原理和实现细节,从而加深对库本身以及DOM操作的理解。 - **掌握最佳实践**:重写过程中可能会遇到各种问题和挑战,开发者需要查阅文档、搜索最佳实践,甚至可能需要阅读源代码,这些都有助于提升编码技巧和解决实际问题的能力。 - **创新能力培养**:在理解基础之上,开发者可能会尝试添加新的功能、改进用户体验或优化性能,这些都可能孕育出创新的解决方案。 #### 3. 重写插件的注意事项 - **避免重复劳动**:在重写之前,应该进行市场调研,确认所要开发的插件功能确实是必要的,避免重复劳动,浪费资源。 - **遵循开源协议**:若原插件是开源的,需要遵循相应的开源协议,例如MIT License,尊重原作者的劳动成果和知识产权。 - **兼容性与测试**:重写插件时要考虑到与原有库的兼容性问题,并且需要进行充分的测试,保证插件在不同环境下都能稳定运行。 #### 4. MIT许可证解读 - **开源协议简介**:MIT许可证是一种非常宽松的开源许可证,允许用户自由使用、复制、修改、分发代码,甚至用于商业目的,只要保留原作者版权声明和许可声明。 - **适用范围**:遵循MIT许可证发布的代码,对使用者几乎没有限制,适合于任何个人或组织。 - **版权声明**:通常包含在源代码文件中,会明确指出原作者的姓名和版权声明文本。 #### 5. jQuery插件开发实践 - **插件结构**:一个典型的jQuery插件结构包括插件定义、默认配置选项、私有函数和公开接口等部分。 - **插件命名**:为了避免与原生jQuery方法或其他插件冲突,插件通常会使用命名空间,并且有一个独特且明确的名称。 - **文档编写**:开发过程中,详细注释和清晰的文档是必不可少的,这对于后续的维护和使用都非常有帮助。 #### 6. jQuery插件应用案例 - **表单验证插件**:例如jQuery Validation Plugin,它提供了一套规则定义和验证方法,用于实现前端表单的校验功能。 - **轮播图插件**:例如Slick或Cycle,它们是用于创建响应式图片和内容轮播的插件。 - **UI组件插件**:例如jQuery UI,它提供了高级交互控件,比如日期选择器、滑动条、模态对话框等。 #### 7. 插件打包与发布 - **构建工具**:为了提高效率,可以使用构建工具如Webpack或Gulp等自动化插件的构建过程。 - **版本管理**:插件发布前,应当为每次更新指定版本号,便于追踪变更和管理依赖。 - **发布渠道**:可以将插件发布到GitHub、npm、CodePen等平台,供更广泛的开发者社区使用和贡献。 通过上述知识点的详细阐述,可以全面理解“Re-inventing-the-wheel”这一概念在jQuery插件开发中的实践意义和操作方法。同时,这些知识点也能为开发者在自定义插件的开发过程中提供指导和帮助。

用代码解决这个问题The program committee of the school programming contests, which are often held at the Ural State University, is a big, joyful, and united team. In fact, they are so united that the time spent together at the university is not enough for them, so they often visit each other at their homes. In addition, they are quite athletic and like walking. Once the guardian of the traditions of the sports programming at the Ural State University decided that the members of the program committee spent too much time walking from home to home. They could have spent that time inventing and preparing new problems instead. To prove that, he wanted to calculate the average distance that the members of the program committee walked when they visited each other. The guardian took a map of Yekaterinburg, marked the houses of all the members of the program committee there, and wrote down their coordinates. However, there were so many coordinates that he wasn't able to solve that problem and asked for your help. The city of Yekaterinburg is a rectangle with the sides parallel to the coordinate axes. All the streets stretch from east to west or from north to south through the whole city, from one end to the other. The house of each member of the program committee is located strictly at the intersection of two orthogonal streets. It is known that all the members of the program committee walk only along the streets, because it is more pleasant to walk on sidewalks than on small courtyard paths. Of course, when walking from one house to another, they always choose the shortest way. All the members of the program committee visit each other equally often. Input The first line contains the number n of members of the program committee (2 ≤ n ≤ 105). The i-th of the following n lines contains space-separated coordinates xi, yi of the house of the i-th member of the program committee (1 ≤ xi, yi ≤ 106). All coordinates are integers. Output Output the average distance, rounded down to an integer, that a member of the program committee walks from his house to the house of his colleague.

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