【AE脚本】基于选择的属性，开启/关闭表达式

/**
 * @author fabiantheblind
 * @description enable expression
 * @source：https://github.com/ff6347/after-effects-script-snippets/blob/master/disable-expression.jsx
 *
 * @todo [description]
 */
/**
 * This snippet disables/enables all sellected expressions
 *
 */
 var curComp = app.project.activeItem;
 app.beginUndoGroup('disable expression');

 for(var i = 0; i < curComp.selectedProperties.length; i++) {
   //如果当前属性开启表达式 则关闭，反之开启 
   var prop = curComp.selectedProperties[i];
   if(prop.expressionEnabled === false) {
     prop.expressionEnabled = true;
   }else{
    prop.expressionEnabled = false;
   }
 }
 app.endUndoGroup();