新增加一个DIV，，加入方法onclick 可以/onMouseOver不可以？
<input type= "button " name= "aa " value= "aa " onclick= "showDiv(); "/>
ABCDE

<script>
function t1(){
alert( "tt ");
}

function showDiv(){
var div = document.createElement( "div ");
div.id = "div1 ";
div.style.top = 300;
div.style.left = 300;
div.style.backgroundColor = "red ";
div.style.display = "inline ";

div.setAttribute( "onMouseOver ", document.all ? eval(function(){t1()}) : 'javascript:t1() ');
div.setAttribute( "onclick ", document.all ? eval(function(){t1()}) : 'javascript:t1() ');

div.innerHTML = "hello, world. ";
document.body.appendChild(div);
}
</script>

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以上代码 onclick 可以/onMouseOver不可以

为什么啊？

[解决办法]
<input type= "button " name= "aa " value= "aa " onmouseover= "showDiv(); "/>

可以，注意大小写