使用保留关键字FilterExpression NodeJS在DynamoDB中扫描函数

My scan function :

我的扫描功能:

var tableName = 'faasos_orders',
    filterExp = 'status = :delivered OR status = :void OR status = :bad',
    projectionValues = '',
    expressionAttr = {};    
    expressionAttr[":delivered"] = "delivered";
    expressionAttr[":bad"] = "bad";
    expressionAttr[":void"] = "void"; 
    limit = 10;
  dynamoConnector.getItemUsingScan(tableName, filterExp, projectionValues, expressionAttr, function (err, data) {  ...........} 
var tableName =