为什么小弟我的alert语句会stack overflow

为什么我的alert语句会stack overflow？
<script   language= "javascript ">
function   onclick()
{
alert( "good   morning! ");
return;
}

</script>

<form>
<input   type= "button "   value= "test "onclick= "onclick(); ">


</form>
我是新手，帮我看看啊

[解决办法]
<script language= "javascript ">
function doclick()
{
alert( "good morning! ");
return;
}

</script>

<form>
<input type= "button " value= "test " onclick= "doclick(); ">