polymer初探_html/css_WEB-ITnose
最近找了几个模块化的方案，posthtml还不是很成熟，css module需要和react一起比较好用，于是尝试了下polymer。
polymer是基于web component规范的，hello-world-polymer可以让我们快速的熟悉polymer。
polymer模块html，css，js都是写一起的， hello-word.html 代码如下
<!-- Imports polymer --><link rel="import" href="../../polymer/polymer.html"><!-- Defines element markup --><dom-module id="hello-world"> <template> <p>Hello <strong>{{who}}</strong> :)</p> </template></dom-module><!-- Registers custom element --><script>Polymer({ is: 'hello-world', properties: { who: { type: String, value: 'World' } }});</script> 定义好模块后，只要在 index.html 文件引入模块，然后用
<!doctype html><html><head> <meta charset="utf-8"> <title><hello-world></title> <!-- Imports polyfill --> <script src="../webcomponentsjs/webcomponents-lite.min.js"></script> <!-- Imports custom element --> <link rel="import" href="build/hello-world.html"></head><body> <!-- Runs custom element --> <hello-world who="world"></hello-world></body></html>
多模块也是没问题的，我们新建一个 hello-module.html ，并且给她一点样式
<!-- Imports polymer --><link rel="import" href="../../polymer/polymer.html"><!-- Defines element markup --><dom-module id="hello-module"> <style> p{ color: red; display: flex; } strong{ color: black; } </style> <template> <p>Hello <strong>{{who}}</strong> :)</p> </template></dom-module><!-- Registers custom element --><script>Polymer({ is: 'hello-module', properties: { who: { type: String, value: 'Module' } }});</script>然后在 index.html 引入
<!doctype html><html><head> <meta charset="utf-8"> <title><hello-world></title> <!-- Imports polyfill --> <script src="../webcomponentsjs/webcomponents-lite.min.js"></script> <!-- Imports custom element --> <link rel="import" href="build/hello-module.html"> <link rel="import" href="build/hello-world.html"></head><body> <!-- Runs custom element --> <hello-module who="module"></hello-module> <hello-world who="world"></hello-world></body></html>
浏览器显示是这样的，polymer已经帮我们加好命名空间，样式是不会相互影响的。
但是一些css3属性怎么办呢，我们还需要autoprefixer或者cssnext。需要三个插件支持，在命令行输入
npm i --save gulp-posthtml posthtml-postcss postcss-cssnext
然后修改 gulpfile.js 文件
var gulp = require('gulp'), postcssPlugins = [require('postcss-cssnext')({ browsers: ['last 10 versions'] })]gulp.task('html', function() { var posthtml = require('gulp-posthtml'); return gulp.src('modules/*.html') .pipe(posthtml([ require('posthtml-postcss')(postcssPlugins) ]/*, options */)) .pipe(gulp.dest('build/'));});gulp.task('watch', function() { gulp.watch("modules/**.html",["html"]);});gulp.task('default', ['html', 'watch']);在命令行输入 gulp 就会实时帮我们编译了。生成的模块代码如下
<!-- Imports polymer --><link rel="import" href="../../polymer/polymer.html"><!-- Defines element markup --><dom-module id="hello-module"> <style> p{ color: red; display: -webkit-box; display: -webkit-flex; display: -ms-flexbox; display: flex; } strong{ color: black; } </style> <template> <p>Hello <strong>{{who}}</strong> :)</p> </template></dom-module><!-- Registers custom element --><script>Polymer({ is: 'hello-module', properties: { who: { type: String, value: 'Module' } }});</script>这样浏览器就支持了，测试了一下，polymer支持安卓4.1，如果测试没什么问题，就可以愉快的用上了。
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