onmouseover和onmouseout一起使用，为何onmouseout的函数无法实现

<!DOCTYPE html>

<html>

<head>

<title>Document</title>

</head>

<body>

<a onmouseover="move()" onmouseout="out()">移动到此处</a>

<body>

<h2 id="con">I love JavaScript</H2>

<p > 鼠标移动改变效果</p>

var h=document.getElementById("con");

h.style.color="red";

h.style.background="#ccc";

function move(){

h.style.display="none";

}

function out()

{

h.style.displau="block";

}

</script>

</body>

</html>

Ahzy

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