让我先介绍两件事。我目前正在使用grunt完成这些任务,我也知道Yeoman有我要求的东西。我真的很喜欢Yeoman,但是对于我正在研究的这个特定项目来说,它有点过于自以为是。
所以我有以下HTML文件:
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title></title>
<meta name="description" content="">
<meta name="viewport" content="width=device-width">
<!-- START-CSS-MIN:css/build/min.css -->
<link rel="stylesheet" href="css/bootstrap/bootstrap-2.1.1.css">
<link rel="stylesheet" href="css/normalize.css">
<link rel="stylesheet" href="css/boilerplate.css">
<!-- END-CSS-MIN -->
<!-- START-JS-MIN:js/build/modernizr.js -->
<script src="js/libraries/modernizr.js"></script>
<!-- END-JS-MIN -->
</head>
<body>
<!--[if lt IE 7]>
<p class="chromeframe">You are using an outdated browser. <a href="http://browsehappy.com/">Upgrade your browser today</a> or <a href="http://www.google.com/chromeframe/?redirect=true">install Google Chrome Frame</a> to better experience this site.</p>
<![endif]-->
<p>Hello world! This is a basline HTML5 template (based on HTML5 Boilerplate).</p>
<!-- START-JS-MIN:js/build/libraries.js -->
<script src="js/libraries/underscore.js"></script>
<script src="js/libraries/jquery/jquery.js"></script>
<!-- END-JS-MIN -->
</body>
</html>
现在您可以看到CSS-MIN和JS-MIN评论。现在我已经有了一个自定义的grunt构建任务,可以在注释中正确收集所有这些文件(使用htmlparser),然后根据注释直接缩小和连接它们。构建过程的最后一步是创建该HTML文件的新版本(供生产使用),用新文件替换注释。例如,上面的代码将变为:
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title></title>
<meta name="description" content="">
<meta name="viewport" content="width=device-width">
<link rel="stylesheet" href="css/build/min.css">
<script src="js/build/modernizr.js"></script>
</head>
<body>
<!--[if lt IE 7]>
<p class="chromeframe">You are using an outdated browser. <a href="http://browsehappy.com/">Upgrade your browser today</a> or <a href="http://www.google.com/chromeframe/?redirect=true">install Google Chrome Frame</a> to better experience this site.</p>
<![endif]-->
<p>Hello world! This is a basline HTML5 template (based on HTML5 Boilerplate).</p>
<script src="js/build/libraries.js"></script>
</body>
</html>
我的问题是如何在NodeJS中执行此操作? htmlparser NPM模块非常适合解析HTML,但是现在我需要修改HTML(在特定位置删除和添加某些元素)。在NodeJS代码中有没有关于如何做到这一点的好包/教程?
答案 0 :(得分:2)
我不太确定这是否对评论行有帮助,但与DOM参考相比,这应该不是一个需要解决的问题。
考虑使用:https://github.com/tmpvar/jsdom
还有其他选择。 (https://github.com/joyent/node/wiki/modules)
答案 1 :(得分:0)
您可以使用cheerio
以下代码将完全生成您提供的输出(除了一些小的空白差异)
const $ = require('cheerio').load(inputHtml);
// Returns a filter function that selects the comments with the provided indexes
const commentRemovalFilter = (commentIndexes)=>{
let commentIndex=-1;
return (index, node)=>{
const isComment = node.type === 'comment';
if(isComment)commentIndex++;
return isComment && commentIndexes.includes(commentIndex);
}
}
$('head').contents().filter(commentRemovalFilter([0,1,2,3])).remove();
$('head link').remove();
$('head script').remove();
//Cheerio respects whitespace provided here
$('head').append(`
<link rel="stylesheet" href="css/build/min.css">
<script src="js/build/modernizr.js"></script>
`)
$('body').contents().filter(commentRemovalFilter([1,2])).remove();
$('body script').remove();
$('body').append(` <script src="js/build/libraries.js"></script>
`)
console.log($.html())
输出:
<html><head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title></title>
<meta name="description" content="">
<meta name="viewport" content="width=device-width">
<link rel="stylesheet" href="css/build/min.css">
<script src="js/build/modernizr.js"></script>
</head>
<body>
<!--[if lt IE 7]>
<p class="chromeframe">You are using an outdated browser. <a href="http://browsehappy.com/">Upgrade your browser today</a> or <a href="http://www.google.com/chromeframe/?redirect=true">install Google Chrome Frame</a> to better experience this site.</p>
<![endif]-->
<p>Hello world! This is a basline HTML5 template (based on HTML5 Boilerplate).</p>
<script src="js/build/libraries.js"></script>
</body></html>