網友那搞來的
<body??? οnlοad="InitEdit()" style="text-align: center">
<iframe id="ex"? height="100" style="WIDTH: 543px; HEIGHT: 246px" allowtransparency? marginheight="30"? ></iframe>
??? <br />
<script type="text/javascript" language="javascript">
??? //當輸入：a,bb,ccc時，附加顏色
??? //這里是實質性的進展.
???
??? var lks = ['a','b','c'];//語言關鍵字
???
??? var editor = window.frames["ex"];??
??? function InitEdit(){?????
??????? editor.document.designMode="On";
??????? editor.document.onkeyup = xx;
??? }???
??? function xx(){???
??????? var rng = editor.document.selection.createRange();
???? rng.moveStart( 'character', -1) ;????
???? for (i=0; i<lks.length; i++){
???????? if (rng.text == lks[i]){
???????????? var text = setFontColor(rng.text,"#6blae6");?
???????????? rng.select() ;?????? ????????
???????????? editor.document.selection.clear() ;??
???????????? rng.pasteHTML(text);
???????? }
???? }??????
??? }
??? function setFontColor(text,fc){
??????? return "<font color=" + fc + ">" + text + "</font>";
??? }???
</script>
</body>

總結

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