When people enter some texts in the textarea, I want the color for some texts will be blue, and some will be green. How to do that?
Use CSS styling, ala: <textarea style="[insert your CSS here]">Blah blah blah content</textarea> -OR- <textarea class="SomeCSSClassHere">Blah blah blah content</textarea> You can also Google around for a rich text editor control to use in place of a simple <textarea> tag. Hope this helps!
Sorry, maybe you misunderstand my question, I want like this: <textarea>blue color text, green color text</textarea>. Among the <textarea>, when user typing, the blue color text shall be blue, and green color text shall be green.