Function tokensToExp

06.Router/basic/js/vue.js:849–857

* Format a list of tokens into an expression. * e.g. tokens parsed from 'a {{b}} c' can be serialized * into one single expression as '"a " + b + " c"'. * * @param {Array} tokens * @param {Vue} [vm] * @return {String}

(tokens, vm)

   */

  function tokensToExp(tokens, vm) {
    if (tokens.length > 1) {
      return tokens.map(function (token) {
        return formatToken(token, vm);
      }).join('+');
    } else {
      return formatToken(tokens[0], vm, true);
    }
  }

  /**
   * Format a single token.