attachEvent带参数函数调用问题

方案一与方案二区别是什么?

方案一:

var obj_input = document.getElementsByTagName("input");
     for(var i=0; i<obj_input.length; i++){
         if(obj_input[i].type.toLowerCase() == 'checkbox'){
             var obj_ev = function(obj_chk){
                 return function(){
                     onRowClick(obj_chk);
                 }
             }
          if(typeof obj_input[i].addEventListener != "undefined"){
                  obj_input[i].addEventListener( 'click', obj_ev(obj_input[i]), false);
             }else if ( typeof obj_input[i].attachEvent != "undefined" ) {
                  obj_input[i].attachEvent('onclick',obj_ev(obj_input[i]));
             }
         }
     }

方案二:

var obj_input = document.getElementsByTagName("input");
     for(var i=0; i<obj_input.length; i++){
         if(obj_input[i].type.toLowerCase() == 'checkbox'){
             if(typeof obj_input[i].addEventListener != "undefined"){
                  obj_input[i].addEventListener( 'click', function(){onRowClick(obj_input[i].)}, false);
             }else if ( typeof obj_input[i].attachEvent != "undefined" ) {
                  obj_input[i].attachEvent('onclick',function(){onRowClick(obj_input[i].)});
             }
         }
     }

自己感觉是一样的,可能调试过程中,方案一是调试可以通过,可方案二怎么也通不过