JavaScript实现按钮禁用与启用的交互效果

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>按钮启用和禁用</title>
<script type="text/javascript">
function btn1()
{
 document.getElementById("btn1").disabled=true;
 document.getElementById("btn1").innerHTML="禁用按钮1";
 document.getElementById("btn2").disabled=false;
 document.getElementById("btn2").innerHTML="启用按钮2";
 }
 //按钮2
function btn2()
{
 document.getElementById("btn1").disabled=false;
 document.getElementById("btn1").innerHTML="启用按钮1";
 document.getElementById("btn2").disabled=true;
 document.getElementById("btn2").innerHTML="禁用按钮2";
 }
</script>
</head>
<body>
<div style="position:absolute;left:400px;top:200px">
<button id="btn1" onclick="btn1();" style="width:100px;height:100px; ">按钮1</button>
<button id="btn2" onclick="btn2();" style="width:100px;height:100px; margin-left:100px ">按钮2</button>
</div>
</body>
</html>