📄 radioevent.html
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<HTML><HEAD><TITLE>选项按钮对象的事件</TITLE>
<SCRIPT LANGUAGE="JavaScript">
function offButton(){
var the_box = window.document.form_1.radio_1;
if (the_box.checked == true){
window.document.form_1.radio_2.checked = false;
document.bgColor='black'; alert("请把灯打开！"); }
}
function onButton()
{ var the_box = window.document.form_1.radio_2;
if (the_box.checked == true)
{ window.document.form_1.radio_1.checked = false;
document.bgColor='white'; alert("谢谢！"); }
}
</SCRIPT>
</HEAD><BODY BGCOLOR="#FFFFFF" TEXT="red">
<form name="form_1">
<input type="radio" name ="radio_1" onClick="offButton();">关灯
<input type="radio" name ="radio_2" onClick="onButton();" checked>开灯
</form>
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