jquery escape html tag

In front-end development, it is often necessary to process some strings containing HTML tags. However, if you insert HTML tags directly into the page, it may cause some security issues, such as malicious script injection, XSS attacks, etc. Therefore, we need to escape the HTML tags so that they appear as original text on the page.

In jQuery, you can use the .text() method to escape HTML tags. This method can convert special characters in HTML tags such as <, >, &, " and ' into their entity-encoded forms. The following is an example:

<div id="my_div"></div>

var my_string = '<img src="image.jpg" alt="My Image">';
$('#my_div').text(my_string);

After executing this code, the page will Display the escaped string <img src="image.jpg" alt="My Image"> instead of the actual image. In this case, we can use . html() method to re-convert the escaped string into a recognized HTML tag, for example:

var my_string = '<img src="image.jpg" alt="My Image">';
$('#my_div').text(my_string);
$('#my_div').html($('#my_div').text());

Doing this will ensure that the tags in the string are displayed correctly on the page.

It should be noted that when using the .html() method, make sure that the string passed to it is credible. Because this method does not perform any escape on the string , if a string containing a malicious script is passed directly to the .html() method, it will cause security problems.

If you need to perform more sophisticated escaping of the string, jQuery The .escapeSelector() and .unescapeSelector() methods are also provided, which can be used to escape and anti-escape special characters in the selector respectively. For example:

var my_selector = '#my_id .my_class';
var escaped_selector = $.escapeSelector(my_selector);
console.log(escaped_selector); // 输出 #my_id .my_class

var unescaped_selector = $.unescapeSelector(escaped_selector);
console.log(unescaped_selector); // 输出 #my_id .my_class

In the above code, the .escapeSelector() method escapes spaces and periods in the selector string to their escaped forms, while the .unescapeSelector() method Restore them to their original characters to ensure the correctness of the selector.

In summary, jQuery provides a variety of methods to escape special characters in HTML tags and selectors to ensure the correctness of the page. Security and correctness. However, we also need to develop good security habits in actual development, such as never trusting user input, using regular expressions to filter all illegal characters, etc.

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