关于Vue单页面骨架屏实践记录(2)
当然这里的skeleton.vue使我们事先写好的骨架屏组件,看起来可能是这样:
<template> <div class="skeleton-wrapper"> <header class="skeleton-header"></header> <div class="skeleton-block"></div> </div> </template>
然后我们需要的是能把skeleton.entry.js编译成服务端渲染可用的bundle文件,所以我们需要有个编译骨架屏的webpack.ssr.conf.js文件:
const path = require('path'); const merge = require('webpack-merge'); const baseWebpackConfig = require('./webpack.base.conf'); const nodeExternals = require('webpack-node-externals'); function resolve(dir) { return path.join(__dirname, dir); } module.exports = merge(baseWebpackConfig, { target: 'node', devtool: false, entry: { app: resolve('./src/skeleton.entry.js') }, output: Object.assign({}, baseWebpackConfig.output, { libraryTarget: 'commonjs2' }), externals: nodeExternals({ whitelist: /\.css$/ }), plugins: [] });
接下来最终的步骤,就是编写我们的webpackPlugin,我们期望我们的webpackPlugin可以帮我们把入口文件编译成bundle,然后再通过vue-server-renderer来render bundle,最终产出响应的html片段和css片段,这里贴出核心代码:
// webpack start to work var serverCompiler = webpack(serverWebpackConfig); var mfs = new MFS(); // output to mfs serverCompiler.outputFileSystem = mfs; serverCompiler.watch({}, function (err, stats) { if (err) { reject(err); return; } stats = stats.toJson(); stats.errors.forEach(function (err) { console.error(err); }); stats.warnings.forEach(function (err) { console.warn(err); }); var bundle = mfs.readFileSync(outputPath, 'utf-8'); var skeletonCss = mfs.readFileSync(outputCssPath, 'utf-8'); // create renderer with bundle var renderer = createBundleRenderer(bundle); // use vue ssr to render skeleton renderer.renderToString({}, function (err, skeletonHtml) { if (err) { reject(err); } else { resolve({skeletonHtml: skeletonHtml, skeletonCss: skeletonCss}); } }); });
最后一步,我们对产出的html片段, css片段进行组装,产出最终的html,所以我们需要监听webpack 的编译挂载之前的事件:
compiler.plugin('compilation', function (compilation) { // add listener for html-webpack-plugin compilation.plugin('html-webpack-plugin-before-html-processing', function (htmlPluginData, callback) { ssr(webpackConfig).then(function (ref) { var skeletonHtml = ref.skeletonHtml; var skeletonCss = ref.skeletonCss; // insert inlined styles into html var headTagEndPos = htmlPluginData.html.lastIndexOf('</head>'); htmlPluginData.html = insertAt(htmlPluginData.html, ("<style>" + skeletonCss + "</style>"), headTagEndPos); // replace mounted point with ssr result in html var appPos = htmlPluginData.html.lastIndexOf(insertAfter) + insertAfter.length; htmlPluginData.html = insertAt(htmlPluginData.html, skeletonHtml, appPos); callback(null, htmlPluginData); }); }); });
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