Ext Html
<!DOCTYPE html><html><head><meta charset="UTF-8"><title>Insert title here</title><link rel = "styleSheet" type = "text/css" href = "../extjs/resources/css/ext-all.css"/><script type = "text/javascript" src = "extjs/adapter/ext/ext-base.js"></script><script type = "text/javascript" src = "extjs/ext-all.js"></script><script type="text/javascript">	Ext.onReady(function(){		var data = [		            ['value1','text1'],		            ['value2','text2'],		            ['value3','text3']		];			var store = new Ext.data.SimpleStore({		fields:['value','text'],		data:data	});var combo = new Ext.form.ComboBox({	store:store,	emptyText:'请选择',	mode:'local',	triggerAction:'all',	valueField:'value',	displayField:'text',	applyTo:'combo',	value:'text1'});});	</script></head><body>	<input  id = "combo" type = "text"></body></html>  SimpleStore 改成ArrayStore  
  applyTo:'combo',   
 要用renderTo:‘combo’  
  var store = new Ext.data.ArrayStore({  
 fields:['value','text'],  
 data:data  
 });  
 还没有效果 
  applyTo:'combo',   
 要用renderTo:‘combo’  
自己找到原因
                        
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