src/compile/references.js
function(key) {

      if (!utils.isArray(key)) key = [key]

      utils.forEach(key, function(key) {
        this.config.unescape[key] = true
      }, this)

    }
function(key) {

      if (!utils.isArray(key)) key = [key]

      utils.forEach(key, function(key) {
        this.config.unescape[key] = true
      }, this)

    }
增加某些函数，不需要执行html转义