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html text hidden

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Release： 2023-05-09 10:12:07

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HTML text hiding refers to quoting certain sensitive information or content that may be disclosed in a web page. Some technical means need to be used to hide and protect it to avoid being used or abused by bad elements. HTML text hiding is not a complicated and difficult thing to understand, and there are many feasible methods and methods in practice. This article will introduce several common HTML text hiding technologies and implementation methods with examples to help readers better understand and apply them.

1. CSS attribute display:none

In HTML text, there are often some tags or content that need to be hidden or protected, such as passwords, phone numbers, email addresses, etc. In this case, CSS can be used Attribute display:none implements hiding.

display:none is used to prevent the specified HTML element from being displayed on the page, and does not occupy space, and does not affect the layout and typesetting of the page. The implementation of this attribute is relatively simple. You only need to add the style attribute to the corresponding HTML tag and assign the value to display:none.

The following is a simple example:

<p style="display:none;">这是需要隐藏的文本内容</p>

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When you use a browser to view this page, the text content will not be displayed. If you need to make the text display again, just change its style attribute to display:block or display:inline.

It should be noted that this method is only suitable for hiding text content. Other types of information such as pictures, links, etc. cannot be hidden and this method does not have security protection functions, so other methods need to be used for processing.

2. CSS attribute visibility:hidden

Similar to display:none, the CSS attribute visibility:hidden can also hide HTML text. The difference is that visibility:hidden will not make the hidden HTML elements disappear from the page, but will still occupy the original position, but will not be visible.

This attribute can also be set through the style attribute. The sample code is as follows:

<p style="visibility:hidden;">这是需要隐藏的文本内容</p>

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To display this text, just change the visibility attribute value to visible. Like the hide attribute, this attribute only operates on the visibility of the element on the page, rather than deleting it. Therefore, it has no effect on page layout.

3. Use JavaScript to hide HTML text

Another method of HTML text hiding is to use JavaScript to operate, which is mainly suitable for more complex text and information hiding needs. Here we will use the "encryption" and "decryption" methods to hide and protect HTML text.

First, we convert the sensitive text content into base64 encoded form, such as:

<script>
    var content = "这是需要隐藏的文本内容";
 
    var encodeContent = window.btoa(content);
    document.write("隐藏前的文本内容：" + content + "<br/>");
    document.write("隐藏后的文本内容：" + encodeContent);
</script>

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Save the result into a variable, and the subsequent JavaScript function uses this variable to implement encryption and decryption of the text content. . It should be noted that although the base64 encryption method is relatively simple, it can still be cracked, so security needs to be considered in practical applications.

Next, let’s write the encryption and decryption function:

<script type="text/javascript">
    function show(){ 
        var pwd = document.getElementById("pwd").value; 
        var decodePwd = window.atob(pwd); 
        document.getElementById("showPwd").style.display="block"; 
        document.getElementById("showPwd").innerHTML = decodePwd; 
    } 
    function hide(){ 
        var pwd = document.getElementById("pwd").value;
        var encodePwd = window.btoa(pwd); 
        document.getElementById("showPwd").style.display="none"; 
        document.getElementById("pwd").value = encodePwd; 
    } 
</script>

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From this, we can hide and decrypt the text content through two buttons. The specific HTML code is as follows:

<body>
    <div id="content">
        <input type="text" id="pwd"> 
        <br> <br> 
        <input type="button" value="隐藏" onclick="hide()"> 
        <input type="button" value="显示" onclick="show()"> 
        <br> <br> 
        <label id="showPwd" style="display:none;"></label> 
    </div>
</body>

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It should be noted that this method protects the privacy and security of the text to a certain extent, but the disadvantage of JavaScript is that if you use the browser's development tools to modify the code, you can easily crack the hiding of the text content. Therefore, measures to strengthen text protection are still needed in practical applications.

4. Use server-side code to hide HTML text

In some applications that require extremely high text hiding protection, server-side encryption and decryption algorithms can be used to hide and hide text content. Protect.

The specific implementation method is to use a certain encryption algorithm on the server side to encrypt the text that needs to be hidden, and then store the encrypted result in a database or file. When the text content needs to be displayed, access it through This storage location performs text decryption. This is more secure and reliable than the JavaScript solution, and is also more expensive to use.

However, this method requires relevant technical support from the server and is relatively troublesome to implement. It is not necessary for most ordinary websites and applications.

In summary, there are many ways and implementation methods for HTML text hiding technology, which can be selected and applied according to actual needs and requirements. It should be noted that when performing text hiding processing, you need to consider the security and protection level of the text, and understand the advantages, disadvantages, and limitations of various methods in order to better protect private information and prevent potential risks.

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