Extracting Metadata from Website

2019-02-28 08:28发布

I was wondering if there's a way in javascript that allows me to process the html source code that allows me to take out specific tags that I want?

Sorry if it sounds easy or too simple. i am new to programming.

回答1:

Use DOM it can pull data from webpages if you know the structure.

回答2:

If you have the HTML in a string, then you can use:

var str = '<html></html>'; // your html text goes here
var div = document.createElement('div');
div.innerHTML = str;
var dom = div.firstChild; // dom is the object you want,
                          // you can manipulate it using standard dom methods

Alternately, use jQuery. jQuery is a library to help you manipulate and access HTML elements more easily. First, add this to the head of your document:

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js"></script>

This is a reference to the jQuery library. Then, do:

var foo = $("<html>Your html here</html>");

Or, if your html is in a variable (e.g. str), you can do:

var foo = $(str);

Then, you can manipulate and parse foo in a number of ways. For example, to remove all paragraph elements, you would use

foo.remove('p');

Or, to remove the paragraph element with id="bar", use:

foo.remove('p.bar');

Once you are done your modifications, you can get the new html text using:

foo.html();

Why is your html in a string? Is it not the html of the current page?