function formatString() {
    if (arguments.length === 0)
      return null;
    var str = arguments[0];
    for (var i = 1; i < arguments.length; i++) {
      var re = new RegExp('\\{' + (i - 1) + '\\}', 'gm');
      str = str.replace(re, arguments[i]);
    }
    return str;
},

formatString('{0},My name is {1}', 'everyMan', '吳孔云')

var myObject = maker(f,l,m,c,s);//不建議寫法
var myObject = maker({//建議寫法
   first : f,
   last: l,
   state:s,
   city:c
});

function render(template, context) {
  //被轉(zhuǎn)義的的分隔符 { 和 } 不應(yīng)該被渲染，分隔符與變量之間允許有空白字符
  var tokenReg = /(\\)?\{([^\{\}\\]+)(\\)?\}/g;
  return template.replace(tokenReg, function (word, slash1, token, slash2) {
    //如果有轉(zhuǎn)義的\{或\}替換轉(zhuǎn)義字符
    if (slash1 || slash2) {
      return word.replace('\\', '');
    }
    // 切割 token ,實(shí)現(xiàn)級(jí)聯(lián)的變量也可以展開
    var variables = token.replace(/\s/g, '').split('.');
    var currentObject = context;
    var i, length, variable;
    for (i = 0, length = variables.length; i < length; ++i) {
      variable = variables[i];
      currentObject = currentObject[variable];
      // 如果當(dāng)前索引的對(duì)象不存在，則直接返回空字符串。
      if (currentObject === undefined || currentObject === null) return '';
    }
    return currentObject;
  })
}
String.prototype.render = function (context) {
  return render(this, context);
};
"{greeting}! My name is { author.name }.".render({
  greeting: "Hi",
  author: {
    name: "hsfzxjy"
  }
});
// Hi! My name is hsfzxjy.

var a = 'kenny'
`my name is ${a}` //"my name is kenny"