HTML文本区域内的样式文本

Question

My problem is that I have textarea and want to find a specified string and mark all of its occurences (something similar to what regex101.com does with regex matches).

This leads me to a more general question (see my question title) and I would like to learn if the following can be applied to parts of text inside a textarea:

• change font color
• change background color
• change font style (bold, italic)
• change font size

Should I use something which already exists (like codemirror )?

I would also appreciate it if someone could explain the idea behind this (for example regex101.com has a textarea but also uses some span elements to highlight the matches)

Answer 1

Have you tried doing something like:

var textArea = document.getElementById("textArea");
textArea.style.color = 'Red';
textArea.style.backgroundColor = 'Black';