/*
        *str 表示要处理的字符串    type 要处理的类型
        *b   去左右两边的空格
        *l   去左边的空格
        *r   去右边的空格
        *m   只去中间的空格
        */


        function trim(str,type){
            var type=type||"b";
            if(type=="b"){
                return str.replace(/^\s*|\s*$/g,"");
            }else if(type=="l"){
                return str.replace(/^\s*/g,"");
            }else if(type=="r"){
                return str.replace(/\s*$/g,"");
            }else if(type=="a"){
                return str.replace(/\s*/g,"");
            }else if(type=="m"){
               
            }
        }
        var str="   succ  ess   ";
        str=trim(str,"m");
        alert("("+str+")");
将去除中间的空格方法完善