如何實現(xiàn)將鼠標移入一個DIV時，使該DIV獲得焦點，將鼠標移入另一個DIV時，改為獲得當前的焦點

div哪有焦點事件，你說的應該是input或者textarea把

你說的是div:hover吧？

<div id="aa" onmouseover="mouseover(this.id)" onmouseout="mouseout(this.id)">ha<div>
<div id="bb" onmouseover="mouseover(this.id)" onmouseout="mouseout(this.id)">haha<div>

function mouseover(pid) {
    alert(pid);
}
function mouseout(pid) {
   alert(pid);
}

應該是用textarea而不是div。

這樣？

<textarea id="test1"></textarea>
<textarea id="test2"></textarea>
<script type="text/javascript">
    var test1 = document.getElementById('test1');
    var test2 = document.getElementById('test2');
    test1.onmouseover = function(){
        this.focus();
    }
    test1.onmouseout = function(){
        this.blur();
    }
    test2.onmouseover = function(){
        this.focus();
    }
    test2.onmouseout = function(){
        this.blur();
    }
</script>