因为FTB自己有库，所以是需要调用它自己的函数来实现的，常用的操作有：
InsertHtml(html)
用于插入html字符串
FTB_API['FreeTextBox1'].InsertHtml("blah <i>blah</i>");SurroundHtml(before,after)
两端插入给定的字符串（HTML也可以）。
FTB_API['FreeTextBox1'].SurroundHtml("<i>before</i>","<u>after</u>");GetHtml()
返回当前编辑器的值(html)。
FTB_API['FreeTextBox1'].GetHtml();
SetHtml(html)
设置当前编辑器的值(html)。
FTB_API['FreeTextBox1'].SetHtml("some new HTML with a table: <table><tr><td>(0, 0)</td><td>(0, 1)</td></tr><tr><td>(1, 0)</td><td>(1, 1)</td></tr></table>");ExecuteCommand(commandName, middle, commandValue)
Executes commands based on the MSHTML (for IE) and Midas (for Firefox/Mozilla) specifications
FTB_API['FreeTextBox1'].GetHtml('bold','',''); FTB_API['FreeTextBox1'].GetHtml('forecolor','','#ffcc00');QueryCommandValue(commandName)
Querys the state of the current cursor position
FTB_API['FreeTextBox1'].GetHtml('forecolor');Focus()
Sets the focus on the current editor
FTB_API['FreeTextBox1'].Focus();
SetStyle(className)
Sets the classname of current element or surrounds the current text with <span class="className">text</span>
FTB_API['FreeTextBox1'].SetStyle(className);
clientSideTextChanged(ftb)
In .NET, set the ClientSideTextChanged property or in JavaScript set
FTB_API['FreeTextBox1'].clientSideTextChanged = myFunction; function myFunction(ftb) { // do something with FreeTextBox }