参见：http://www.w3cgroup.com/article.asp?id=198 insertHTML Inserts an HTML string at the insertion point (deletes selection). Requires a valid HTML string to be passed in as a value argument. (Not supported by Internet Explorer.) insertImage Inserts an image at the insertion point (deletes selection). Requires the image SRC URI string to be passed in as a value argument. The URI must contain at least a single character, which may be a white space. (Internet Explorer will create a link with a null URI value.)
insertHTML
Inserts an HTML string at the insertion point (deletes selection). Requires a valid HTML string to be passed in as a value argument. (Not supported by Internet Explorer.) insertImage
Inserts an image at the insertion point (deletes selection). Requires the image SRC URI string to be passed in as a value argument. The URI must contain at least a single character, which may be a white space. (Internet Explorer will create a link with a null URI value.)