调用form.submit()方法不同,而结果也不同?
<!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= " ">  
     </HEAD>  <SCRIPT   LANGUAGE= "JavaScript ">  
     <!-- 
 	function   cc() 
 	{ 
                         alert( "cc "); 
                      document.forms[0].submit();   
 	} 
 	function   check() 
 	{ 
 	            alert( "false "); 
 		return   false; 
 	} 
    //-->  
     </SCRIPT>    
     <BODY>  
        <form   name= "form1 "   id= "form1 "   onsubmit= "return   check(); ">  
        <input   type= "button "   onclick= "cc() "   value= "submit "/>  
        <input   type= "submit "   value= "submit ">  
        </form>  
     </BODY>  
  </HTML>  
 为何第一个submit不触发onsubmit事件呢?
------解决方案--------------------改成这样就好了: 
  <!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= " ">  
   </HEAD>  <SCRIPT LANGUAGE= "JavaScript ">  
   <!-- 
 	function cc() 
 	{ 
         alert( "cc "); 
        //document.forms[0].submit(); 
 	document.getElementById( "btnSubmit ").click(); 
 	} 
 	function check() 
 	{ 
 	    alert( "false "); 
 		return false; 
 	} 
  //-->  
   </SCRIPT>    
   <BODY>  
    <form name= "form1 " id= "form1 " onsubmit= "return check(); ">  
    <input type= "button " onclick= "cc() " value= "submit "/>  
    <input type= "submit " value= "submit " id= "btnSubmit ">  
    </form>  
   </BODY>  
  </HTML>    
 我在做一些类似的问题时也遇到过跟你一样的问题,原因不得而知,一般都是通过对一个type为submit的按钮的click事件来实现对表单的提交。