为什么我if语句一直判定else 是这个条件错了么
<style>
#test{
display:none;
width:120px;
height:50px;
border:1px solid blue;
}
#tesy{
display:none;
width:120px;
height:50px;
border:1px solid red;
}
#tesx{
display:none;
width:120px;
height:50px;
border:1px solid green;
}
</style>
</head>
<body>
<div id="test">1</div>
<div id="tesy">2</div>
<div id="tesx">3</div>
<button onclick="sayHello()">点我！</button>
<script type="text/javascript">
function sayHello()
{
var test1=document.getElementById("test");
var test2=document.getElementById("tesy");
var test3=document.getElementById("tesx");
if(test1.style.display=="none")
{
test1.style.display="block";
}
else
{
test2.style.display="block";
}
}
</script>
</body>
</html>
