在光标处添加文字，或对选择的文字进行更改（JS:TextRange）
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" ><head> <title>Untitled Page</title>
<script language="javascript" type="text/javascript">
function Blod()
{
Format("粗体","'''");
} function Italic() { Format("斜体","''"); } function Format(formatName,format) { var textarea = document.getElementById("txaContent"); if(textarea.pos != null) { var s = textarea.pos.text; if(s == null || s == 'undefined'||s == '') { s = formatName ; } s = format + s + format; textarea.pos.text = s; } else { textarea.value += format+formatName+format; } }
</script></head><body><textarea id="txaContent" cols="20" rows="20" onselect="this.pos = document.selection.createRange();" onclick="this.pos = document.selection.createRange();" onkeyup="this.pos = document.selection.createRange();" ></textarea><input type="button" onclick="Blod()" value="Blod" id="btnBlod" /><input type="button" onclick="Italic()" value="Italic" id="btnItalic" /></body></html>