dist/viewer.common.js
function prev() {
    var loop = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;

    var index = this.index - 1;

    if (index < 0) {
      index = loop ? this.length - 1 : 0;
    }

    this.view(index);
    return this;
  }
function prev() {
    var loop = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;

    var index = this.index - 1;

    if (index < 0) {
      index = loop ? this.length - 1 : 0;
    }

    this.view(index);
    return this;
  }
function prev ( ) { var loop = arguments . length > 0 && arguments [ 0 ] !== undefined ? arguments [ 0 ] : false ; var index = this . index - 1 ; if ( index < 0 ) { index = loop ? this . length - 1 : 0 ; } this . view ( index ) ; return this ; }
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@param {boolean} [loop=false] - Indicate if view the last one
when it is the first one at present.
@returns {Viewer} this
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