var format = function(str, obj){
                var data = obj;

                if(typeof data === 'object'){
                    return str.replace(/\{([\d\w]+)\}/g, function (m, n) {         //替换掉 {xxx} 格式的字符串
                        return (typeof data[n] !== 'undefined') ? data[n].toString() : m;
                    });
                }
            },
       dom = '<div>{name},我的博客地址:{link}</div>',
       json = {
                         name: '大马德',
                         link: 'http://home.cnblogs.com/u/damade/'
                  }

format(dom,json)  //输出 <div>大马德,我的博客地址:http://home.cnblogs.com/u/damade/</div>