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d="M90.461 40.316a26.753 26.753 0 0 1-7.702 2.109 13.445 13.445 0 0 0 5.897-7.417 26.843 26.843 0 0 1-8.515 3.253 13.396 13.396 0 0 0-9.79-4.233c-7.404 0-13.409 6.005-13.409 13.409 0 1.051.119 2.074.349 3.056-11.144-.559-21.025-5.897-27.639-14.012a13.351 13.351 0 0 0-1.816 6.742c0 4.651 2.369 8.757 5.965 11.161a13.314 13.314 0 0 1-6.073-1.679l-.001.17c0 6.497 4.624 11.916 10.757 13.147a13.362 13.362 0 0 1-3.532.471c-.866 0-1.705-.083-2.523-.239 1.706 5.326 6.657 9.203 12.526 9.312a26.904 26.904 0 0 1-16.655 5.74c-1.08 0-2.15-.063-3.197-.188a37.929 37.929 0 0 0 20.553 6.025c24.664 0 38.152-20.432 38.152-38.153 0-.581-.013-1.16-.039-1.734a27.192 27.192 0 0 0 6.692-6.94z"></path></svg> </span> <br> <span>资深软件开发工程师，业余马拉松选手。</span> </div>
这是小白的零基础JavaScript全栈教程。
JavaScript是世界上最流行的脚本语言，因为你在电脑、手机、平板上浏览的所有的网页，以及无数基于HTML5的手机App，交互逻辑都是由JavaScript驱动的。
简单地说，JavaScript是一种运行在浏览器中的解释型的编程语言。
那么问题来了，为什么我们要学JavaScript？尤其是当你已经掌握了某些其他编程语言如Java、C++的情况下。
简单粗暴的回答就是：因为你没有选择。在Web世界里，只有JavaScript能跨平台、跨浏览器驱动网页，与用户交互。
Flash背后的ActionScript曾经流行过一阵子，不过随着移动应用的兴起，没有人用Flash开发手机App，所以它目前已经边缘化了。相反，随着HTML5在PC和移动端越来越流行，JavaScript变得更加重要了。并且，新兴的Node.js把JavaScript引入到了服务器端，JavaScript已经变成了全能型选手。
JavaScript一度被认为是一种玩具编程语言，它有很多缺陷，所以不被大多数后端开发人员所重视。很多人认为，写JavaScript代码很简单，并且JavaScript只是为了在网页上添加一点交互和动画效果。
但这是完全错误的理解。JavaScript确实很容易上手，但其精髓却不为大多数开发人员所熟知。编写高质量的JavaScript代码更是难上加难。
一个合格的开发人员应该精通JavaScript和其他编程语言。如果你已经掌握了其他编程语言，或者你还什么都不会，请立刻开始学习JavaScript，不要被Web时代所淘汰。
等等，你会问道，现在有这么多在线JavaScript教程和各种从入门到精通的JavaScript书籍，为什么我要选择这个教程？
原因是，这个教程：
不要再犹豫了，立刻从现在开始，零基础迈向全栈开发工程师！
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