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jsoo编程实例之确认按钮的选择下拉框

编程HTML 
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
 <HEAD>
  <TITLE> New Document </TITLE>
  <META NAME="Generator" CONTENT="EditPlus">
  <META NAME="Author" CONTENT="">
  <META NAME="Keywords" CONTENT="">
  <META NAME="Description" CONTENT="">
<SCRIPT LANGUAGE="JavaScript">
  <!--
	
	ConfirmSelect = function(obj){
		this.ops = document.getElementById(obj.id);
		var oldValue = this.ops.value;
		this.ops.onchange = function(){
			if(!confirm(obj.confirmMsg)){
				this.value=oldValue;
			}
			oldValue = this.value;
		}
		
	}
	
	window.onload = function(){
		new ConfirmSelect({
			id         : 'a',
			confirmMsg : '您确定要修改这项吗，不修改请按取消。'
		});
	}
  //-->
  </SCRIPT> 
 
 </HEAD>

 <BODY>
  <select id='a' name='sourceDbName' >
	<option value="table1">table1</option>
	<option value="table2">table2</option>
	<option value="table3">table3</option>
  </select>
  <div id='b'></div>
 </BODY>
</HTML>
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