<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
</head>
<body>
<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);" >例子例子例子例子例子</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>
<div id="box" contenteditable="true" style="border:1px solid #ccc; width:300px; height:200px;">sljfldjfldf</div>
</body>
</html>
推荐：http://www.cnblogs.com/huanlei/p/3242096.html
