js变量比较大全

<script type="text/javascript">
  <!--
	alert("typeof(NaN)结果:"+typeof(NaN));
	
	alert("typeof(Infinity)结果:"+typeof(Infinity));
	
	alert("typeof(null)结果:"+typeof(null));
	
	alert("typeof(undefined)结果:"+typeof(undefined));
	
	alert("NaN==NaN结果:"+(NaN==NaN));
	
	alert("NaN!=NaN结果:"+(NaN!=NaN));
	
	alert("NaN>NaN结果:"+(NaN>NaN));
	
	alert("null==undefined结果:"+(null==undefined));

	alert("null>=undefined结果:"+(null>=undefined));    
  
	alert("null<=undefined结果:"+(null<=undefined));
  
	alert("null==null结果:"+(null==null));  
  
	alert("null!=null结果:"+(null!=null));   
  
	alert("null!=NaN结果:"+(null!=NaN));   
  
	alert("null==NaN结果:"+(null==NaN));  
  
	alert("NaN==undefined结果:"+(NaN==undefined));   
  
	alert('parseInt("123abc")结果:'+parseInt("123abc"));  
  
	alert('"123abc"-0结果:'+("123abc"-0));   
  
	alert("Infinity>10结果:"+(Infinity>10));   
  
	alert('Infinity>"abc"结果:'+(Infinity>"abc"));   
  
	alert("Infinity==NaN结果:"+(Infinity==NaN));  
  
	alert("true==1结果:"+(true==1));   
  
	alert('new String("abc")=="abc"结果:'+(new String("abc")=="abc"));   
  
	alert('new String("abc")==="abc"结果:'+(new String("abc")==="abc"));   

  //-->
  </script>