<p>

　<div id='text' contenteditable=true style='width:100px;height:100px;border:1px #ccc;'>abc</div>

</p>

<script>

function test1(){

var div = document.getElementById("text");

var range = document.createRange();

var len = div.childNodes.length;

range.setStart(div, len);

range.setEnd(div, len);

getSelection().addRange(range);

div.focus();

}