我是这样做的：先获得文本框的值TextArea.Value，然后.TextArea.Value＋其他文本
<script type="text/javascript">
function setCaret(textObj){
if(textObj.createTextRange){
textObj.caretPos=document.selection.createRange().duplicate();
}
}
function insertAtCaret(textObj,textFeildValue){
if(document.all){
if(textObj.createTextRange&&textObj.caretPos){
var caretPos=textObj.caretPos;
caretPos.text=caretPos.text.charAt(caretPos.text.length-1)==''?textFeildValue+'':textFeildValue;
}else {
textObj.value=textFeildValue;
}
}else {
if(textObj.setSelectionRange){
var rangeStart=textObj.selectionStart;
var rangeEnd=textObj.selectionEnd;
var tempStr1=textObj.value.substring(0,rangeStart);
var tempStr2=textObj.value.substring(rangeEnd);
textObj.value=tempStr1+textFeildValue+tempStr2;
}else {
alert("This version of Mozilla based browser does not support setSelectionRange");
}
}
}
</script>
<form id="form1" action="" onsubmit="" method="post" enctype="text/plain">
<p>
<textarea name="tarea" rows="" cols="" style="width:300px;height:120px;" onselect="setCaret(this);" onclick="setCaret(this);" onkeyup="setCaret(this);">
Dnew.cn Dnew.cn
</textarea>
<br/><br/>
<input type="text" name="textfield" style="width:220px;" value="插入FireFox"/>
<br/>
<input type="button" value="插入" onclick="insertAtCaret(this.form.tarea,this.form.textfield.value);"/>
</p>
</form>
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