if(document.addEventListener){//如果是Firefox 
            document.addEventListener("keypress",fireFoxHandler, true); 
        }else{ 
            document.attachEvent("onkeypress",ieHandler); 
        } 
        function fireFoxHandler(evt){ 
            if(evt.keyCode==13){ 
                com_search(); 
            } 
        } 
        function ieHandler(evt){ 
            if(evt.keyCode==13){ 
                com_search(); 
            } 
        }

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