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fieldLabel : '经度',
name : 'hpLon',
id : 'hpLon',
allowBlank : false,
blankText : '经度不能为空!',
value:hpLon,
vtype:"testLon",
listeners : {
	"blur" : function(value) {
		transForm(this.id);
	}
}

Ext.apply(Ext.form.VTypes, { 
	testLon: function(v){

//规范的经度表示法ddd°mm′ss.sss″
var lonTest1 = /^((\d|[1-9]\d|1[0-7]\d)[°](\d|[0-5]\d)[′](\d|[0-5]\d)(\.\d{1,6})?[\″]$)|(180[°]0[′]0[\″]$)/;
    	
//有分没秒的表示法ddd°mm.mmm′
var lonTest2 = /^((\d|[1-9]\d|1[0-7]\d)[°](\d|[0-5]\d)(\.\d{1,6})?[′]$)|(180[°]0[′]$)/;

//只有度的表示法 ddd.ddd°
var lonTest3 = /^((\d|[1-9]\d|1[0-7]\d)(\.\d{1,6})?[°]$)|(180[°]$)/;
    		var s1 = v.split("°");
        	var state;
    		if(s1[1] != '' && s1[1] != null){
    			var s2 = s1[1].split("′");
    			if(s2[1] != '' && s2[1] != null){
    				var s3 = s2[1].split("″");
    				state = lonTest1.test(v);
    			}else{
    				state = lonTest2.test(v);
    			}
    		}else{
    			state =  lonTest3.test(v); 
    		}
    	}
	if(state){
    		return true;
    	}else{
    		return false;
    	}
	},
	 testLonText: "经度格式不正确",
		 
	testLat:  function(v) {
		 var latTest1 = /^((\d|[1-8]\d)[°](\d|[0-5]\d)[′](\d|[0-5]\d)(\.\d{1,6})?[\″]$)|(90[°]0[′]0[\″]$)/;
		 var latTest2 = /^((\d|[1-8]\d)[°](\d|[0-5]\d)(\.\d{1,6})?[′]$)|(90[°]0[′]$)/;
		 var latTest3 = /^((\d|[1-8]\d)(\.\d{1,6})?[°]$)|(90[°]$)/;
		 var state;
		  		var s1 = v.split("°");
				if(s1[1] != '' && s1[1] != null){
					var s2 = s1[1].split("′");
					if(s2[1] != '' && s2[1] != null){
						var s3 = s2[1].split("″");
						state = latTest1.test(v);
					}else{
						state = latTest2.test(v);
					}
				}else{
					state =  latTest3.test(v); 
					
				}
		   	}
		   	
		   	if(state){
		   		return true;
		   	}else{
		   		return false;
		   	}
		   },
		 testLatText: "纬度格式不正确"
});

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这个是把判断放在vtype中判断的

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而transForm 这个是个方法,去转换经纬度,看你到底要以哪种形式显示出来