前端面试需要准备什么

这个话题已经是老生常谈了。把这个问题放在第一个的原因，也是因为这是所有前端工程师在面试前最关注的问题——前端面试到底要考什么？

这问题如果别人问我，我第一反应肯定是：”那还用说，当然是HTML、CSS、JS、三大框架、jQuery、性能优化、数据结构算法等等”。

先不要着急下结论，所谓知己知彼，百战不殆。我们首先来研究一下9102年国内外十余家大厂的前端工程师的JD（Job Description）：

国外

Bachelor’s degree in a technical discipline or equivalent practical experience.
1 year of experience in Software Development.
Experience in JavaScript, and one or more programming languages: Java, C/C++, Python or Go.
Experience with front end technologies and/or front end frameworks.

Experience with HTML5 and CSS3 web standards.
Knowledge of web libraries and frameworks, such as AngularJS, Polymer, Closure or Backbone.
Developed web design skills and user experience fundamentals knowledge.
Familiarity with the full web stack, including protocols and web server optimization techniques.

Bachelor’s degree in Computer Science or equivalent work experience
5+ years of overall software development experience, with an emphasis on web applications
Experience building rich data-driven web applications
Experience with modern web technologies and techniques such as HTML5, CSS3, ECMAScript 2016, CSS pre-processors **(SASS, Less, Stylus), **JavaScript transpilers (Babel, CoffeeScript, TypeScript), and JavaScript build tools (Browserify, WebPack, Grunt, Gulp)
Experience with modern JavaScript frameworks and libraries such as React, Redux, Ractive, Ember, or Angular, along with the knowledge of when to use them
Experience with Node.js and the NPM package ecosystem

A passion for creating beautiful, engaging, intuitive, efficient and highly usable user interfaces
Experience with vector and motion graphics, including SVG, HTML5 Canvas, WebGL (ThreeJS) and animation via JavaScript and CSS
Familiarity with real-time communication mechanisms such as WebSockets and WebRTC
Familiar emerging trends in desktop, web, and mobile app development
Experience with deployments, DevOps, and / or AWS

以下是这些JD中出现的关键词：