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来源：4-9 编程练习

localhost999

2021-09-12 20:29:23

<!DOCTYPE html>
<html>
    <head>
    <meta charset="UTF-8">
    <title>onload</title>
    <script type="text/javascript">
     window.onload=function(){
     document.getElementById("a");
     var red=a;
     a.onclick=function(){
     this.style.color="red";
     }
     a.onmouseleave=function(){
     this.style.color="grey";
     }
     }
    </script>
</head>
<body>
<input type="button" value="点击改变按钮字体颜色" id="a">
</body>
</html>

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