HTML DOM Document execCommand() 方法

要执行的命令的名称：

• "backColor"

• "bold"

• "createLink"

• "copy"

• "cut"

• "defaultParagraphSeparator"

• "delete"

• "fontName"

• "fontSize"

• "foreColor"

• "formatBlock"

• "forwardDelete"

• "insertHorizontalRule"

• "insertHTML"

• "insertImage"

• "insertLineBreak"

• "insertOrderedList"

• "insertParagraph"

• "insertText"

• "insertUnorderedList"

• "justifyCenter"

• "justifyFull"

• "justifyLeft"

• "justifyRight"

• "outdent"

• "paste"

• "redo"

• "selectAll"

• "strikethrough"

• "styleWithCss"

• "subscript"

• "superscript"

• "undo"

• "unlink"

• "useCSS"