问AS2 :如何从输入中删除文本格式

EN

var k:String = '<TEXTFORMAT+LEADING="2"><P+ALIGN="CENTER"><FONT+FACE="Trebuchet+MS"+SIZE="38"+COLOR="%23CCCCCC"+LETTERSPACING="0"+KERNING="0">22<%2FFONT><%2FP><%2FTEXTFORMAT>';

var xml:XML = new XML(k);

trace(xml.firstChild.firstChild.firstChild.firstChild);     // gives : 22

this.createTextField('text_field', 0, 0, 0, 0, 0);
text_field.html = true;
text_field.htmlText = k;

trace(text_field.text);     // gives : 22

text_field.removeTextField();