检查代码要优化吗

来源：3-4 编程练习

weixin_慕的地5241954

2019-09-01 17:40:07

<!DOCTYPE html>
<html>
<head lang="en">
        <meta charset="UTF-8">
        <title>onload</title>
        <script type="text/javascript">
            //补充代码
window.onload=function(){
var btn=document.getElementsByTagName("input")[0];
var clicked=function(){
this.style.color="red";
}
btn.onclick=clicked;
var mouseout=function(){
this.style.color="gray";
}
btn.onmouseout=mouseout;
}
        </script>
    </head>
    <body>
        <input type="button" value="点击改变按钮字体颜色" >
    </body>
</html>

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