whole_func_string: function(key) {
          var obj = this.loadVar(key);
          if (!obj || typeof (obj) != 'object') {
              exitProcess('the value of ' +key+' is a necessary object ,but get '+ obj, this.alarm);
              return false;
          }
          return obj;
      }
func_code_string: function(key) {
          var obj = this.loadVar(key);
          if (!obj || typeof (obj) != 'object') {
              exitProcess('the value of ' +key+' is a necessary object ,but get '+ obj, this.alarm);
              return false;
          }
          return obj;
      }
func_documentation_string: Get object value by key, the value must be exist, otherwise the process will exit.
  
  @param {KeyItem} key
  @returns {Object}