<html>
<head>
<title></title>
<script type="text/javascript">
function alert_test(){
alert("this is a alert");
}
</script>
</head>
<body>
<input type="button" onclick="alert_test()" value="click it">
</body>
</html>
javascript 【2018.11.28】
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转载自blog.csdn.net/weixin_30589127/article/details/84593953
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