ES6中的String.raw

String.raw({raw: ‘test‘}, 1,2,3,4);    //t1e2s3t
等同于
String.raw({raw: [‘t‘,‘e‘,‘s‘,‘t‘]}, 1,2,3,4)

String.raw = function (strings, ...values) {
  var output = "";
  for (var index = 0; index < strings.length; index++) {
    output += strings.raw[index] + values[index];
  }

  output += strings.raw[index]
  return output;
}