//一种简单快速的模板解析方法，活用with

var parseTpl = function( str, data ) {

    var tmpl = 'var __p=[];' + 'with(obj||{}){__p.push(\'' +

            str.replace( /\\/g, '\\\\' )

                .replace( /'/g, '\\\'' )

                .replace( /<%=([\s\S]+?)%>/g, function( match, code ) {

                    return '\',' + code.replace( /\\'/, '\'' ) + ',\'';

                } )

                .replace( /<%([\s\S]+?)%>/g, function( match, code ) {

                    return '\');' + code.replace( /\\'/, '\'' )

                        .replace( /[\r\n\t]/g, ' ' ) + '__p.push(\'';

                } )

                .replace( /\r/g, '\\r' )

                .replace( /\n/g, '\\n' )

                .replace( /\t/g, '\\t' ) +

            '\');}return __p.join("");',

        func = new Function( 'obj', tmpl );

    return data ? func( data ) : func;

};

//demo

var ong={

    name:"caoke",

    va:"va"

}

parseTpl("<%=va%><%for(var i=0;i<3;i++)%><%=i%>sfd<%=va%>",ong)

//var __p=[];with(obj||{}){__p.push('',va,'');for(var i=0;i<3;i++)__p.push('',i,'sfd',va,'');}return __p.join("");