confirm的用法示例用于按钮操作时确定是否执行
<script type = "text/javascript" language = "javascript">
function clear1() {
if(confirm("确定要清空数据吗？")) {
document.main.text1.value = ""; }
}
</script>
<body>
<form name="main">
<input type="text" name="text1" />
<input type="button" name="Submit" value="清空数据" onClick="return clear1();">
</form>
</body>
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