src/Class.js
function addAttributes(attrs) {
  _.forEach(attrs, (v, k) => {
    if (v.type !== undefined) {
      this.addAttribute(k, v.type, v.mandatory, v.errorCallback)
    } else {
      this.addAttribute(k, v)
    }
  })
}
function addAttributes(attrs) {
  _.forEach(attrs, (v, k) => {
    if (v.type !== undefined) {
      this.addAttribute(k, v.type, v.mandatory, v.errorCallback)
    } else {
      this.addAttribute(k, v)
    }
  })
}
function addAttributes ( attrs ) { _ . forEach ( attrs , ( v , k ) => { if ( v . type !== undefined ) { this . addAttribute ( k , v . type , v . mandatory , v . errorCallback ) } else { this . addAttribute ( k , v ) } } ) }
Add several attributes
@method
@memberof Class~ClassInstance
@param {Object} attrs - The attributes to add. The keys are te attribute name,
the values are the attributes descriptors.
See {@link Class~ClassInstance#RemoveAttribute} for
the supported properties.
Add several attributes