改变选中字体颜色（可多次改变）（兼容火狐）
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>new document</title>
<script type="text/javascript">
function setColor(){
if(document.all){
var tr = document.selection.createRange();
if(tr.parentElement().id != "editor"){
return;
}
tr.execCommand("ForeColor", false, "#FF0000");
}else{
var tr = window.getSelection().getRangeAt(0);
if(tr.commonAncestorContainer.parentNode.id != "editor"){
return;
}
var span = document.createElement("span");
span.style.cssText = "color:#ff0000";
tr.surroundContents(span);
}
}
</script>
</head>
<body>
<div id="editor" contenteditable="true">fdjlksafjd;slafjd;slakfjds</div>
<div>123456</div>
<input type="button" onclick="setColor()" value="setColor" />
</body>
</html>
转自：http://topic.csdn.net/u/20100423/15/b6a08676-5cc4-42f4-bcda-ae5d8a836139.html 的25楼